Books like 'Unknown Horizons'

Readers who enjoyed Unknown Horizons by C.J. Birch also liked the following books featuring the same tropes, story themes, relationship dynamics and character types.

sc-fi  romance  space  lgbtq  romantic-love  wlw  space-opera

  • Layers of Force by Lindsay Buroker

    Layers of Force by Lindsay Buroker

    Rated: 4.72 of 5 stars
    · 26 ratings
    The exciting conclusion to the Star Kingdom series!Even though Professor Casmir Dabrowski has been fighting for months to help the kingdom and humanity as a whole, few people in positions of power have appreciated his unorthodox methods. Now he's a captive of the king and being taken back to his home world without his friends or the crushers he relies upon to protect him...
  • Home Front by Lindsay Buroker

    Home Front by Lindsay Buroker

    Rated: 4.67 of 5 stars
    · 24 ratings
    Casmir and his allies have struck a devastating blow to the powerful prince who sent invaders into their star system, but war still rages at home. Worse, the prince has escaped with a lethal bioweapon, and he intends to wipe out all human life on Odin. Casmir could lose his parents, his friends, and everyone he holds dear...
  • Planet Killer by Lindsay Buroker

    Planet Killer by Lindsay Buroker

    Rated: 4.65 of 5 stars
    · 24 ratings
    Casmir has survived against impossible odds, and now he longs to return home. But an invasion force is blockading the Kingdom’s wormhole gate, and it would be suicidal to fly through it now. Worse, his family and friends are stuck on the other side, with hostile forces attacking their home world. The only way Casmir can help is to find out who’s behind the invasion… and convince him to stop...
  • Perilous Waif by E. William Brown

    Perilous Waif by E. William Brown

    Rated: 4.42 of 5 stars
    · 30 ratings
    My name is Alice Long, and I’ve always known I was different. When I was little I used to climb up to the highest branches of the housetree at night, and watch the starships docking at the orbital stations high above. Forty meters off the ground, watching ships thirty thousand kilometers overhead, with senses that could pick out radar pings and comm chatter as easily as the ships themselves...
  • 残次品 [Can Ci Pin | Imperfections] by Priest

    残次品 [Can Ci Pin | Imperfections] by Priest

    Rated: 4.63 of 5 stars
    · 8 ratings
    “这是最好的时代,也是最坏的时代。”——狄更斯《双城记》“我带着深藏骨血的仇恨与酝酿多年的阴谋,把自己变成一个死而复生的幽灵,沉入沼泽,沉入深渊,我想埋下腐烂的根系,长出见血封喉的荆棘,刺穿这个虚伪的文明。我到了淤泥深处……捡到了一颗星星。”It was the best of times, it was the worst of times.—— C. Dickens《A Tale of Two Cities》I took my hatred and plot for revenge with me down the mire, to the depths of the abyss, and returned as a ghost of the past...
    Categorized as:
    lgbtq  space-opera  romance  sci-fi  fiction  dystopia  mlm  space
  • Mindline by M.C.A. Hogarth

    Mindline by M.C.A. Hogarth

    Rated: 4.50 of 5 stars
    · 10 ratings
    At the advice of Vasiht'h, his first and truest friend, Jahir Seni Galare has accepted one of the most coveted residencies in xenotherapy, even though doing so has severed him from all the relationships he's fostered since leaving his cloistered homeworld...
  • Divinity 36 by Gail Carriger

    Divinity 36 by Gail Carriger

    Rated: 4.50 of 5 stars
    · 10 ratings
    The aliens are coming for us and they want our voices.New York Times bestselling author Gail Carriger brings you a gloriously warm and unique scifi about the power of art, celebrity, and found family.Phex is a barista on a forgotten moon. Which is fine – he likes being ignored and he’s good at making drinks. Until one day an alien hears him singing and recruits him to become a god...
  • Dawn of Chaos by Benjamin Medrano

    Dawn of Chaos by Benjamin Medrano

    Rated: 4.67 of 5 stars
    · 6 ratings
    There will be hell to pay.Evelyn’s parents have been missing for more than thirty years, and at last Evelyn has a clue as to their fate. Investigating won’t be easy, even for someone as powerful as she is, yet she won’t be deterred...
    Categorized as:
    lgbtq  wlw  space-opera  romance  fantasy  harem  sci-fi  space
  • Plan B by Sharon Lee, Steve Miller

    Plan B by Sharon Lee, Steve Miller

    Rated: 4.42 of 5 stars
    · 24 ratings
    "A real page-turner" (ANNE MCCAFFREY) in the Liaden Universe(r) series.Fugitive Val Con yos'Phelium plans a desperate gamble by forming an alliance with Clan Erob. But his cousin, Shan yos'Galen can't wait. With enemy agents closing in, he invokes Plan B-setting in motion a series of events that will have dire consequences-for all of Liad...
  • Adept of Chaos by Benjamin Medrano

    Adept of Chaos by Benjamin Medrano

    Rated: 4.57 of 5 stars
    · 7 ratings
    Evelyn's deeds are coming back to haunt her.Free to travel among the stars, the former warlord is enjoying her freedom, even if she’s occasionally exasperated by the women who’ve attached themselves to her. They accompany her as she encounters wonders, from dryad terraforming ships to the orcish arenas of Skaloth.Yet Evelyn has enemies, and they have not forgotten her...
  • Space for More by Emily Antoinette

    Space for More by Emily Antoinette

    Rated: 4.57 of 5 stars
    · 7 ratings
    All Dr. Eden Mori wanted was to expand her horizons on the galaxy's largest space station, but when the only way to stop a black market sale of dangerous medical schematics is to get close to the data dealer, she's tasked with stopping him. Her partner on this mission? The dealer's estranged, hot-tempered mate...
    Categorized as:
    lgbtq  wlw  romance  sci-fi  polyamory  monsters  space  aliens
  • Chosen of Chaos by Benjamin Medrano

    Chosen of Chaos by Benjamin Medrano

    Rated: 4.44 of 5 stars
    · 9 ratings
    Evelyn enjoyed living a nice, quiet life in an anarchic pirate port, far from the world she’d once conquered.Then came an attack by mercenaries that made her angry...
  • Scout's Progress by Sharon Lee, Steve Miller

    Scout's Progress by Sharon Lee, Steve Miller

    Rated: 4.41 of 5 stars
    · 23 ratings
    In the second novel of the Liaden Universe, Aelliana Caylon is a brilliant mathematician, but is convinced by her brother she has no worth beyond what value she might have in an arranged marriage. Then on a dare, she plays a game of chance and wins a starship. Now she must learn to fly if she is to escape her dastardly brother. Appeared in the omnibus "Pilot's Choice...
  • Knight Protector by Lindsay Buroker

    Knight Protector by Lindsay Buroker

    Rated: 4.38 of 5 stars
    · 22 ratings
    A sci-fi romance set in the Star Kingdom universe.The characters from this book will be introduced in book 6 of the series. An arranged marriage she can’t escape. A sexy bodyguard who will protect her at all cost...
  • Conflict of Honors by Sharon Lee, Steve Miller

    Conflict of Honors by Sharon Lee, Steve Miller

    Rated: 4.32 of 5 stars
    · 27 ratings
    Sixteen-year-old Priscilla Delacroix was declared legally dead by her mother, High Priestess of the Goddess. Banished to survive on her own, Priscilla has roamed the galaxy for ten years as an outcast—to become a woman of extraordinary skill. . . .An experienced officer assigned to the Liaden vessel Daxflan, she's been abandoned yet again...
  • Carpe Diem by Sharon Lee, Steve Miller

    Carpe Diem by Sharon Lee, Steve Miller

    Rated: 4.36 of 5 stars
    · 23 ratings
    On the run from assassins, Val Con yos'Phelium and Miri Robertson are stranded on a distant planet and must learn to trust each other if they're going to survive - and learn to love each other if they're going to heal the dark wounds of their past...
  • Fate of Draga by Emma Dean

    Fate of Draga by Emma Dean

    Rated: 4.50 of 5 stars
    · 6 ratings
    The queen is the deadliest piece.The finale to this epic space fantasy series is here. Adelina, Varan, Kaiden, and Nash have to find a way to survive what comes. Adelina will give her life for her people, but her mates will give their life for her.Find out who survives, who doesn't, and how all your favorite characters make it through the battle of a lifetime...
  • Inversion Point by Jenn Burke, Kelly Jensen

    Inversion Point by Jenn Burke, Kelly Jensen

    Rated: 4.38 of 5 stars
    · 8 ratings
    Zander and Felix's relationship has been to the brink and back: the Human-Stin War, imprisonment and an actual death/resurrection. Zander's death, to be specific, and the experience has left him…changed. The mysterious race known as the Guardians chose to revive him and appointed him as their emissary...
  • Triple Threat by M.R. Forbes

    Triple Threat by M.R. Forbes

    Rated: 4.38 of 5 stars
    · 8 ratings
    Hayley Cage never expected to find herself on the other side of the galaxy, as a healer on a team of rough and tough mercenaries hunting Satan's secret army. But then, life doesn't always go as planned...
  • Taji from Beyond the Rings by R. Cooper

    Taji from Beyond the Rings by R. Cooper

    Rated: 4.30 of 5 stars
    · 10 ratings
    The Interplanetary Trade Coalition has not been welcomed with open arms by the Sha Empire. Isolated at the far edge of a distant system, the Sha are distrustful of outsiders, and previous I.P.T.C. diplomatic missions have ended with members imprisoned or dead. But, if pushed enough, the I.P.T.C. will overrun the planet to take what it wants...
  • Demigod 12 by Gail Carriger

    Demigod 12 by Gail Carriger

    Rated: 4.30 of 5 stars
    · 10 ratings
    Puts the opera back into space opera.New York Times bestselling author Gail Carriger continues her cozy and engaging scifi about the power of art, celebrity, and found family.Phex and his pantheon have become demigods and are taking their show on a galaxy-wide tour...
  • The Caphenon by Fletcher DeLancey

    The Caphenon by Fletcher DeLancey

    Rated: 4.48 of 5 stars
    · 14 ratings
    On a summer night like any other, an emergency call sounds in the quarters of Andira Tal, Lancer of Alsea. The news is shocking: not only is there other intelligent life in the universe, but it’s landing on the planet right now.Tal leads the first responding team and ends up rescuing aliens who have a frightening story to tell...
  • Mindtouch by M.C.A. Hogarth

    Mindtouch by M.C.A. Hogarth

    Rated: 4.25 of 5 stars
    · 12 ratings
    Seersana University is worlds-renowned for its xenopsychology program, producing the Alliance's finest therapists, psychiatric nurses and alien researchers. When Jahir, one of the rare and reclusive Eldritch espers, arrives on campus, he's unprepared for the challenges of a vast and multicultural society... but fortunately, second-year student Vasiht'h is willing to take him under his wing...
  • Balance of Trade by Sharon Lee, Steve Miller

    Balance of Trade by Sharon Lee, Steve Miller

    Rated: 4.21 of 5 stars
    · 14 ratings
    Assistant Trader Jethri Gobelyn was an honest, hardworking young man who knew a lot about living onboard his family's space-going trade ship; something about trade, finance, and risk-taking; and a little bit about Liadens. It was, oddly enough, the little bit he knew about Liadens that seemed like it might be enough to make his family's fortune, and his own, too...
  • Without a Front: The Warrior’s Challenge by Fletcher DeLancey

    Without a Front: The Warrior’s Challenge by Fletcher DeLancey

    Rated: 4.62 of 5 stars
    · 10 ratings
    An assassin's shot has shattered the Opah family and endangered Lancer Andira Tal. Now criminal forces are racing law enforcement to find the man who could topple Tal's government.With the net closing around them, Tal and Salomen Opah discover the power of their tyree bond, a power Alsea has not seen in a millennium...
    Categorized as:
    lgbtq  space-opera  wlw  action-adventure  adult  aliens  book  crime
  • Without a Front: The Producer's Challenge by Fletcher DeLancey

    Without a Front: The Producer's Challenge by Fletcher DeLancey

    Rated: 4.60 of 5 stars
    · 10 ratings
    Alsea is fractured in the aftermath of war. So is its leader.Though devastated by a personal loss, Lancer Andira Tal must somehow stitch her world together and move it forward when all the rules have changed. Every decision is fraught with risk, and her enemies wait for her to stumble...
  • Trader's Leap by Sharon Lee, Steve Miller

    Trader's Leap by Sharon Lee, Steve Miller

    Rated: 4.47 of 5 stars
    · 13 ratings
    NEW ENTRY IN THE LANDMARK LIADEN UNIVERSE® SERIESThe only bridge between past and future is a leap of faith. Pursued by enemies, exiled Liaden clan Korval is settling into a new base on backworld Surebleak. Moving is expensive, as is war, and Korval is strapped for cash. Delm Korval has therefore instructed Master Trader Shan yos'Galan to design and implement new trade routes, quickly...
  • Accepting the Lance by Sharon Lee, Steve Miller

    Accepting the Lance by Sharon Lee, Steve Miller

    Rated: 4.43 of 5 stars
    · 14 ratings
    NEW NOVEL IN THE NATIONALLY BEST-SELLING LIADEN UNIVERSE® SERIES. Sequel to national bestseller Neogenesis. Exiled from Liad after bombing a city to save it from The Department of the Interior’s infernal weapons and plans, Clan Korval has gone to ground on the back-water planet Surebleak, whose people are as untamed as its weather...
  • Fractured Stars by Lindsay Buroker

    Fractured Stars by Lindsay Buroker

    Rated: 4.37 of 5 stars
    · 16 ratings
    McCall Richter finds criminals, con men, and deadbeats better than anyone else in the empire. She’s proud of her success and that she owns her own spaceship, especially since she struggles to understand human motivations, can’t tell when people are lying to her, and is horrible at recognizing faces...
  • The Lily and the Crown by Roslyn Sinclair

    The Lily and the Crown by Roslyn Sinclair

    Rated: 4.25 of 5 stars
    · 24 ratings
    Ariana “Ari” Geiker lives an isolated life on an imperial space station commanded by her father. The skilled, young botanist rarely leaves her living quarters, where she maintains an elaborate garden. When an imperious older woman is captured from a pirate ship and given to her as a slave, Ariana’s perfectly ordered life is thrown into chaos...
  • Courier Run by Sharon Lee, Steve Miller

    Courier Run by Sharon Lee, Steve Miller

    Rated: 4.33 of 5 stars
    · 6 ratings
    Two new Liaden Universe® adventures! Novelette "Kin Ties" explores the ties that bind beloved kin -- and desperate enemies. Short story "Guaranteed Delivery" is a tale of love, leadership, and insurance fraud. Both stories appeared in slightly altered form on the authors' Splinter Universe website...
  • Regi's Goddess by Lyn Gala

    Regi's Goddess by Lyn Gala

    Rated: 4.33 of 5 stars
    · 6 ratings
    Regi and Dante landed on one of the Empire's border planets while the exalteds try to understand the involvement of the gods. Regi's people are xenophobic, so he's determined that his crew will make a good impression. The alternative is unthinkable, especially with so many Kowri suggesting that the gods would rather see the outsiders dead rather than show them respect...
    Categorized as:
    lgbtq  space-opera  romance  sci-fi  mlm  aliens  fantasy  space
  • Ocean's Echo by Everina Maxwell

    Ocean's Echo by Everina Maxwell

    Rated: 5.00 of 5 stars
    · 5 ratings
    Ocean’s Echo is a stand-alone, romantic space adventure, set in the same universe as Everina Maxwell's hit debut, Winter's Orbit.When Tennal—a rich socialite, inveterate flirt, and walking disaster—is caught using his telepathic powers for illegal activities, the military decides to bind his mind to someone whose coercive powers are strong enough to control him...
    Categorized as:
    lgbtq  space-opera  action-adventure  adult  book  fiction  mlm  space
  • Clan, Honor, and Empire by Tracy St. John

    Clan, Honor, and Empire by Tracy St. John

    Rated: 4.25 of 5 stars
    · 8 ratings
    Dramok Rajhir has never had to go without. He’s been blessed with the best schooling, a prestigious pedigree, a fine home, plus all the intimate companionship a young Kalquorian male could ask for. But with status comes responsibility. His father insists Rajhir assume his place in Kalquorian society as soon as possible...
    Categorized as:
    lgbtq  adult  aliens  book  fiction  mlm  paranormal  politics
  • Clan and Conviction by Tracy St. John

    Clan and Conviction by Tracy St. John

    Rated: 4.25 of 5 stars
    · 8 ratings
    The drug Delir is sweeping the Kalquorian Empire, leaving madness and death in its wake. Investigator Dramok Gelan has already lost his enforcer partner in a deadly shootout because of the case. With no clues or suspects, he despairs of putting an end to the epidemic. Then a familiar face enters the picture: new partner and former lover Nobek Wynhod...
  • Starship Mine by Peter Cawdron

    Starship Mine by Peter Cawdron

    Rated: 4.20 of 5 stars
    · 10 ratings
    James Patterson is a gay accountant living in Keyes, Oklahoma—deep in the Bible Belt—the religious heartland of America. He’s also the first person to make contact with an extraterrestrial intelligence seeking to understand our world, and that makes him the most important person on the planet...
  • The General's Mate by C.W. Gray

    The General's Mate by C.W. Gray

    Rated: 4.20 of 5 stars
    · 10 ratings
    Welcome back to the Blue Solace: (Sequel to "The Mercenary's Mate") Leti Ando and Will Hackett are certain about one thing in all the galaxy. They love one another. Now that they are mated, it's time to meet Hack's parents and settle into their new home. In a normal courtship, the two would spend time getting to know one another and reveling in their love. Normal isn't what they get...
    Categorized as:
    lgbtq  space-opera  romance  mlm  sci-fi  aliens  fantasy  omegaverse
  • Crownchasers by Rebecca Coffindaffer

    Crownchasers by Rebecca Coffindaffer

    Rated: 4.14 of 5 stars
    · 14 ratings
    A deadly competition for the throne will determine more than just the fate of the empire in this duology opener.Alyssa Farshot has spent her whole life trying to outrun her family legacy. Her mother sacrificed everything to bring peace to the quadrant, and her uncle has successfully ruled as emperor for decades...
  • Ghosts of Trappist by K.B. Wagers

    Ghosts of Trappist by K.B. Wagers

    Rated: 4.21 of 5 stars
    · 7 ratings
    NeoG--the Near-Earth Orbital Guard, a diverse military force that patrols and protects the solar system, inspired by the real-life mission of the Coast Guard--and the crew of Zuma's Ghost are under attack, and shocking truths are about to be exposed.What the black takes should stay in the black...
  • Seed of Chaos by Benjamin Medrano

    Seed of Chaos by Benjamin Medrano

    Rated: 4.67 of 5 stars
    · 6 ratings
    Fame is overrated.Having rescued thousands of people from being sacrificed, Evelyn could use some peace and quiet. Life has other plans. She quickly finds herself drawn into assisting a deity with a small problem, only to return and find that her great grandmother has learned of her existence...
    Categorized as:
    lgbtq  wlw  space-opera  romance  fantasy  sci-fi  space  polyamory
  • The Stars Too Fondly by Emily Hamilton

    The Stars Too Fondly by Emily Hamilton

    Rated: 4.20 of 5 stars
    · 5 ratings
    In her breathtaking debut—part space odyssey, part sapphic rom-com—Emily Hamilton tells a tale of galaxy-spanning friendship, improbable love, and found family. So, here’s the thing: Cleo and her friends really, truly didn’t mean to steal this spaceship...
    Categorized as:
    lgbtq  wlw  romance  sci-fi  fantasy  fiction  space  found-family
  • Black Sky Morning by Hanna Dare

    Black Sky Morning by Hanna Dare

    Rated: 4.17 of 5 stars
    · 6 ratings
    A bounty hunter in over his head.Xin knows how to look out for himself, and he knows when something sounds too good to be true. But a forgotten planet filled with riches is too tempting to pass up. Fortunately Xin also knows someone who can back him up - if he doesn't arrest Xin first. A government agent who's lost hope.Jonathan Gray used to believe in a better future. Now he's not so sure...
  • The Wayward Prince by Hanna Dare

    The Wayward Prince by Hanna Dare

    Rated: 4.17 of 5 stars
    · 6 ratings
    Spaceships, daring heists, and interstellar intrigue!  Since murderous AIs drove humanity from Earth more than a century before, people have been rebuilding civilization. That doesn't mean the galaxy is anywhere close to being civilized. A liar and a scoundrel - and he's the good guy...
  • Rebel's Quest by Gun Brooke

    Rebel's Quest by Gun Brooke

    Rated: 4.17 of 5 stars
    · 6 ratings
    On a world torn by war, two women discover a love that defies boundaries, challenges allegiances, and that just might mean the survival—or destruction—of all they hold dear.Roshan O’Landha, a Gantharian resistance fighter, works hard to maintain her cover as a wealthy businesswoman as war on occupied Gantharat seems imminent...
  • Salvation by Caryn Lix

    Salvation by Caryn Lix

    Rated: 4.17 of 5 stars
    · 6 ratings
    When Kenzie and her friends find themselves trapped on a strange planet, they must risk everything to save themselves and Earth in this thrilling final book in the addictive Sanctuary trilogy!Fall down seven times, get up eight. These are the words Kenzie has always lived by. The problem is, she’s fallen down too many times to count...
  • Star Crossed: 7 Novels of Space Exploration, Alien Races, Adventure, and Romance by Christine Pope, C. Gockel

    Star Crossed: 7 Novels of Space Exploration, Alien Races, Adventure, and Romance by Christine Pope, C. Gockel

    Rated: 4.17 of 5 stars
    · 6 ratings
    Sci-fi to fall in love with… 7 full-length novels that explore the future without forgetting that the most dangerous battles will always be within the human heart. Aliens, AI, cyborgs, galactic empires, space battles, and romance...you’ll find them all here, along with heroines and heroes you’ll cheer for...
  • Unchained: a science fiction romance adventure by Ruby Lionsdrake

    Unchained: a science fiction romance adventure by Ruby Lionsdrake

    Rated: 4.17 of 5 stars
    · 6 ratings
    One geeky neuroscientist sent to research the inmates of a prison asteroid. Two cyborg criminals determined to free the inmates. A forbidden romance among the stars. Dr. Skylar Russo, a woman known for her research skills rather than her people skills, wants nothing more than to forget that her fiancé left her at the altar...
  • Ghosts & Ashes by F.T. Lukens

    Ghosts & Ashes by F.T. Lukens

    Rated: 4.17 of 5 stars
    · 6 ratings
    Three months have passed since the events of The Star Host, and Ren is living aboard the Star Stream under the watchful eyes of the Phoenix Corps. Plagued by vivid nightmares that ravage the ship in his sleep, he struggles to prove he isn’t a threat and fears he has traded one captor for another...
    Categorized as:
    lgbtq  action-adventure  aliens  book  fiction  mlm  space  young-adult
  • The Significant by Kyra Anderson

    The Significant by Kyra Anderson

    Rated: 4.17 of 5 stars
    · 6 ratings
    The beloved leader of a planet... A non-citizen fugitive... And a secret love that could kill them both. Kailynn Evada was born on the most powerful planet in the Altereye System, but was raised in the non-citizen district of Trid. She always dreamed of revolution and changing the injustices of the planet Tiao. But when her brother’s plot to destroy the A.I...
    Categorized as:
    lgbtq  wlw  adult  audiobook  bisexuality  book  dystopia  fiction
  • Nightmare by Steven Harper

    Nightmare by Steven Harper

    Rated: 4.17 of 5 stars
    · 6 ratings
    Before Kendi learned to use his talent of navigating the plane of mental existence known as the Dream, he had to escape his physical existence as a slave...
Fantastic book recommendations by book lovers for book lovers.
Find out more about thebooknaut.com.



Looking for more inspiration? Enter another book title to get more suggestions on what to read next.


Or - use our amazing romance book finder to get recommendations based on your favorite content tropes and themes. Mix and match at will.