Books like 'Delphi Challenge'

Readers who enjoyed Delphi Challenge by Bob Blanton & Jessica Gurd also liked the following books featuring the same tropes, story themes, relationship dynamics and character types.

sc-fi space action / adventure military, war & conflict aliens space-opera coming-of-age ai space-travel exploration

Acheron Inheritance by Ken Lozito
Rated: 4.50 of 5 stars
· 10 ratings
First, the Federation Wars toppled the galactic order.On a dying world along the galactic fringe, Quinton Aldren awakens in the body of an archaic android that’s barely operational. He has only vague memories of who he was and no idea what has happened...

Categorized as:
ai aliens colonization first-contact invasion military space-fleet space-opera
The Colossus by Jay Allan
Rated: 4.50 of 5 stars
· 10 ratings
The Hegemony strikes again… The Confederation and its allies have won their first victory, retaken their capital from he forces of the Hegemony. But the enemy is not beaten, far from it, and they are back, with an unstoppable weapon, a vast superbattleship, a deadly hybrid of imperial and Hegemony technology, called the Colossus...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
Elvians by S.H. Jucha
Rated: 4.50 of 5 stars
· 10 ratings
Two crises challenge the Omnians. Alex Racine’s fleet draws a first-contact conflict, which faces the Ollassa, a symbiotic flora race. The Omnian fleet sails from alliance space in an effort to interdict an alien ship that arrives at the Worlds of Lights, the Ollassa system. Soon after arriving, the alien ship deploys machines to scour asteroids for resources in the system’s far belt...

Categorized as:
ai aliens exploration first-contact invasion space-opera space-travel action-adventure
SADEs by S.H. Jucha
Rated: 4.50 of 5 stars
· 10 ratings
Dangerous forces are at work across galactic space that the Omnians are attempting to stabilize, but their resources are severely strained. The SADEs, self-aware digital entities, express to Alex Racine and Renée de Guirnon their desire to know the method of their creation. Alex and Renée, the Omnian co-leaders, want to obtain the knowledge for the SADEs, who are humans’ closest allies...

Categorized as:
ai aliens exploration first-contact invasion military space-opera space-travel
Delphi Colony by Bob Blanton, Jessica Gurd
Rated: 4.42 of 5 stars
· 12 ratings
Book 8 of the popular series Delphi in Space. The McCormacks are finally going to start an Earth Colony and the Paraxeans are finally getting a home. Catie is going to the Academy and Marc is going to Artemis...

Categorized as:
ai aliens colonization coming-of-age exploration first-contact invasion military
Nua'll by S.H. Jucha
Rated: 4.42 of 5 stars
· 12 ratings
The Omnian expeditionary fleet sails for the faraway place they call “the wall.” The worlds of humankind have consolidated their resources to create a powerful armada to confront the alien federation.During the Omnians’ previous encounter with an alien fleet at the wall, the Nua’ll comm sphere spoke to them in multiple languages...

Categorized as:
aliens exploration first-contact invasion military space-fleet space-opera space-travel
Delphi Diversion by Bob Blanton
Rated: 4.42 of 5 stars
· 12 ratings
Catie is on her way back to Earth after having settled the Fazulan slaves when the wormhole her ship is traveling in collapses. They are diverted to another system where big chunks are flying around. They rescue a ship and find themselves in the middle of a series of mysteries...

Categorized as:
aliens exploration first-contact military space-fleet space-opera space-travel action-adventure
The Lost Supernova by Vaughn Heppner
Rated: 4.42 of 5 stars
· 12 ratings
Androids used to mingle among us, pretending to be human. Then an alien puppet-master altered their programming. Unknown to us, androids began leaving human society, burning their clothes and peeling off their skin to reveal the chrome-colored bodies underneath. They gathered in a system were a star had exploded, blowing away the atmosphere of a Jupiter-like planet...

Categorized as:
aliens colonization exploration invasion military space-fleet space-opera space-travel
Rising Force by Ken Lozito
Rated: 4.42 of 5 stars
· 12 ratings
Eight months have passed since the Star Shroud barrier was engaged to protect the Earth, but it won’t last, and humanity is scrambling to build a fleet. Cut off from home, the crew of the Athena has taken refuge on the Boxan colony world, a last safe haven for the creators of the Star Shroud...

Categorized as:
ai aliens exploration first-contact invasion military space-fleet space-opera
Delphi Alliance by Bob Blanton
Rated: 4.44 of 5 stars
· 24 ratings
The McCormacks have their floating city growing in the South Pacific, and their space station well underway. As they continue their quest to unite Earth and bring her into the modern age of space travel and repair her environment before it’s too late, they have to fight with the major powers that aren’t too sure they want to change the status quo...

Categorized as:
ai aliens first-contact invasion military space-fleet space-opera action-adventure
Leviathan's Fear: A Military Sci-Fi Series by Craig Martelle
Rated: 4.67 of 5 stars
· 6 ratings
Trapped in Ga’ee space, Leviathan runs for its life.And the lives of its crew.Declan Payne and Harry Wesson decide to go on the offensive. They have no choice.They can’t go home. It only delays the inevitable.The Ga’ee march relentlessly into the space of the seven races while turning an inward eye toward the interloper, the ship they call God1...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
Give No Quarter by Jamie McFarlane
Rated: 4.46 of 5 stars
· 21 ratings
Alternate cover for ASIN B01FQ57I7G can be found here: Give No Quarter Branded criminals and on the run from the most powerful corporation in the known universe, Liam Hoffen and the crew of Hotspur have a simple choice to make...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
Junkyard Spaceship by Jamie McFarlane
Rated: 4.46 of 5 stars
· 21 ratings
When aliens threaten his country, one grumpy old vet will take the fight to the stars.Albert Jenkins would like nothing more than to putter around his junkyard, selling parts and working on old cars. When an alien spacecraft is shot down by US Air Defense and crash lands on his newly rebuilt home, he’s dragged back into the fight of his life...

Categorized as:
aliens exploration first-contact invasion military space-opera space-travel action-adventure
Prince Peacemaker by Fred Huges
Rated: 4.50 of 5 stars
· 8 ratings
Hazard survived the war… but can he survive the peace?The empire defeated the Swarm at the Battle of Iris, but it came at a great cost. To win, Hazard King needed to reveal he was Crown Prince Henry and take command of the Imperial Fleet as War Leader. Now their enemy is suing for peace, something many in the empire don’t want to give...

Categorized as:
military aliens invasion colonization space-travel first-contact space-fleet exploration
Prince Commander by Fred Hughes
Rated: 4.50 of 5 stars
· 8 ratings
Hazard King was ready to get back to a normal life…Well, as normal a life as the next emperor of the Brittania Empire could expect, anyway. Hazard wanted to continue his naval career—to grow and take on positions of higher responsibility—because he knew the Swarm would be back, and he intended to be there to fight them when they returned...

Categorized as:
aliens invasion colonization military space-travel first-contact space-fleet exploration
Crusade by Glynn Stewart
Rated: 4.40 of 5 stars
· 10 ratings
A newborn Alliance, forged to stop the destroyers of worldsA potential ally, with secrets hidden by a thousand liesA long-doomed star, whose ruins hold a vital answer...

Categorized as:
ai aliens exploration first-contact invasion military space-fleet space-opera
Galactar by Anthony James
Rated: 4.40 of 5 stars
· 10 ratings
Following decades of war and the recent catastrophic loss of an entire planet, the Human Planetary Alliance is riven by internal disputes and rivalries. The military’s old guard fights for power against those who see a chance to turn things around.After a series of hard-fought victories, Captain Carl Recker is becoming recognized as a man who gets results - a man who knows how to beat the Daklan...

Categorized as:
aliens exploration invasion military space-fleet space-opera space-travel action-adventure
Fulcrum Gun by Anthony James
Rated: 4.40 of 5 stars
· 10 ratings
Lost in hostile space and pursued by the most powerful warship in the known universe, Captain Carl Recker is losing hope and running out of options. His battleship Fulcrum is no match for this enemy and the Meklon aliens who might have helped him are dead, killed by the Galactar’s murderous weaponry.Somehow, Recker must find a way to succeed where the might of an alien empire already failed...

Categorized as:
aliens exploration invasion military space-fleet space-opera space-travel action-adventure
Winds of Vengeance by Jay Allan
Rated: 4.40 of 5 stars
· 10 ratings
Earth Two. A new home for the survivors of the fleet, the men and women who battled against seemingly insurmountable odds to survive the assault of the First Imperium and to destroy the homicidal Regent, the artificial intelligence committed to their destruction...

Categorized as:
ai aliens colonization exploration first-contact invasion military space-fleet
Laws of Ancidium by Anthony James
Rated: 4.40 of 5 stars
· 10 ratings
Having fought his hardest battle, Captain Carl Recker returns to planet Lustre, bringing the alien battleship Fulcrum with him.Recker is under no illusions that he’ll be offered backdated shore leave, but his feet don’t even touch the ground before trouble shows up. A heavily armed fifty-thousand-metre Meklon interstellar drops out of lightspeed near the planet...

Categorized as:
aliens exploration invasion military space-fleet space-opera space-travel action-adventure
The Dark Invaders by Raymond L. Weil
Rated: 4.40 of 5 stars
· 10 ratings
From USA Today Best Selling Author Raymond L. Weil comes the second book in the Star Cross series. Over fourteen months have passed since Fleet Admiral Kurt Vickers drove the Profiteers from Earth. Eighty million people died while the planet was being ransacked and its wealth stolen. Now a new and deadlier threat comes from intergalactic space...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
The Long Voyage of the Little Fleet by Mackey Chandler
Rated: 4.40 of 5 stars
· 10 ratings
In the first book of this series "Family Law", Lee's parents and their business partner Gordon found a class A habitable planet. They thought their quest as explorers was over and they'd live a life of ease. But before they could return and register their claim Lee's parents died doing a survey of the surface...

Categorized as:
aliens exploration first-contact military space-fleet space-opera space-travel action-adventure
Refuge by Glynn Stewart
Rated: 4.36 of 5 stars
· 11 ratings
A dying world, shattered by a broken machineA desperate flight, their only hope for refugeA robotic race, ally and destroyer alikeThe Republic of Exilium has grown in strength and confidence at the far end of the galaxy from the rest of mankind, sending out scout ships to survey the worlds around them as they try to learn more about the mysterious Construction Matrix AIs...

Categorized as:
ai aliens exploration first-contact invasion military space-fleet space-opera
Omnia by S.H. Jucha
Rated: 4.33 of 5 stars
· 12 ratings
Alex Racine, who led an elite group of humans and SADEs (self-ware digital entities), left the newly discovered planet of Celus-5 under difficult circumstances. Few of the Harakens with Alex thought there was little he could do to bring peace to the embroiled planet...

Categorized as:
aliens exploration first-contact invasion military space-opera space-travel action-adventure
Celus-5 by S.H. Jucha
Rated: 4.33 of 5 stars
· 12 ratings
For the Sojourn’s initial mission, the Haraken explorer ship undertakes the investigation of Celus-5, a world identified by Willem, a SADE (self-aware digital entity), and his team of scientists, as the best prospect for a new colony.What should be a routine survey mission becomes a disaster. To the Harakens’ surprise, they discover, not one, but two alien species engaged in conflict...

Categorized as:
aliens exploration first-contact invasion military space-opera space-travel action-adventure
Fracture by Ken Lozito, Scott Aiello
Rated: 4.33 of 5 stars
· 12 ratings
Colonel Sean Quinn is stranded in another universe, along with two thousand people under his command. They've been hiding from the enemy long enough, now it’s time to return home. Outnumbered against a superior foe, Sean must risk everything in a daring operation, but the mysterious enemy has a few surprises of their own...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
The Prince Awakens by Fred Hughes
Rated: 4.33 of 5 stars
· 12 ratings
Hazard King had always wanted to be an Imperial Fleet officer, just like his father.But he’s a Prince of the Realm, which make things a bit more… complicated. And when Hazard’s parents tell him that they don’t trust his older brother and want Hazard to be the Crown Prince—the heir to the throne—things go from bad to worse.And just when they can’t get any worse, the Empress is attacked...

Categorized as:
space-opera military aliens invasion colonization space-travel first-contact space-fleet
Direct Fire by Rick Partlow
Rated: 4.41 of 5 stars
· 21 ratings
From street criminal to war hero.From outcast to Marine officer.The journey has been a long one, but now it’s reaching the end.Cam Alvarez leads his platoon of Drop-Troopers into the Tahni Imperium, into the final days of the war and the bloodiest battles yet...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
Exile by Glynn Stewart
Rated: 4.31 of 5 stars
· 13 ratings
A shackled Earth, ruled by an unstoppable tyrantAn exiled son, and a one-way trip across the galaxyA perfect world, their last hope for survivalVice Admiral Isaac Gallant is the heir apparent to the First Admiral, the dictator of the Confederacy of Humanity. Unwilling to let his mother's tyranny stand, he joins the rebellion and leads his ships into war against the might of his own nation...

Categorized as:
aliens exploration invasion military space-fleet space-opera space-travel action-adventure
Emergence by Ken Lozito, Scott Aiello
Rated: 4.29 of 5 stars
· 14 ratings
As the colony grapples with the realization that New Earth is not as uninhabited as they’d once thought, tensions between the colonial settlements rise to new heights, and the Colonial Defense Force finds itself caught in the middle. When Connor uncovers evidence of a militant colonial faction secretly exploiting the NEIIS, he has to investigate...

Categorized as:
aliens colonization exploration first-contact invasion military space-opera space-travel
Sol by S.H. Jucha
Rated: 4.35 of 5 stars
· 24 ratings
Sol’s warships paid the ultimate price for threatening the Haraken and New Terran worlds. Now, Haraken President Alex Racine and his Méridien partner, Renée de Guirnon, are engaged in a desperate gamble to stop a war between their worlds and United Earth’s (UE) massive forces before it starts...

Categorized as:
ai aliens first-contact invasion military space-opera space-travel action-adventure
The Others by Jay Allan
Rated: 4.46 of 5 stars
· 17 ratings
From the deepest darks of unknown space, evil comes… Admiral Tyler Barron and the Confederation navy face a new threat, darker and deadlier than any that have come before...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
When the Axe Falls by Jon R. Osborne
Rated: 4.50 of 5 stars
· 6 ratings
The clouds of war continue to build…and not everyone is blind… Bjorn Tovesson III, the owner of Bjorn’s Berserkers, is a man tied to the past, but who’s not afraid to innovate. Whether it is new tactics or new equipment, Bjorn is willing to try anything, once, in an effort to grow his company into the status of the fabled Four Horsemen...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-travel
Dirty Deeds by Mark Wandrey
Rated: 4.50 of 5 stars
· 6 ratings
Old mercs don't die, you do. Abraham Murdock left his home of Sheridan Arkansas at seventeen to start a merc career that spanned almost 50 years, working for dozens of companies, killing aliens and getting paid across the galaxy. Near the end of his career, he landed a gig with Cartwright’s Cavaliers...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-travel
Dark Moon Arisen by Chris Kennedy, Mark Wandrey
Rated: 4.50 of 5 stars
· 6 ratings
The war continues! The Omega War is in full swing. Earth has fallen to General Peepo’s army, and the surviving Human mercenaries have taken refuge at the hidden Winged Hussars’ base in New Warsaw...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
Star Force: Temple Wars by Aer-ki Jyr
Rated: 4.50 of 5 stars
· 6 ratings
he bell has been rung, and the Return of the Reignor has come...

Categorized as:
aliens colonization exploration invasion military space-fleet space-opera space-travel
Corruption by Sarah Noffke, Michael Anderle
Rated: 4.50 of 5 stars
· 6 ratings
A new evil lurks in the darkness. After an explosion, the crew of a battlecruiser mysteriously disappears.Bailey and Lewis, complete strangers, find themselves suddenly onboard the damaged ship. Lewis hasn’t worked a case in years, not since the final one broke his spirit and his bank account. The last thing Bailey remembers is preparing to take down a fugitive on Onyx Station...

Categorized as:
aliens exploration first-contact invasion military space-fleet space-opera space-travel
Alpha Contracts by Chris Kennedy, Mark Wandrey
Rated: 4.50 of 5 stars
· 6 ratings
“Before CASPers were the lords of the battlefield, men tested their metal against aliens one-on-one.” First contact has been made, and Earth’s militaries and its premier mercenary companies stand ready to take their first tentative steps outside the Solar System...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
A Pale Dawn by Chris Kennedy, Mark Wandrey
Rated: 4.50 of 5 stars
· 6 ratings
The tides of war have shifted, and humanity has the Galactic Union on the run. After a stunning victory at the Merc Guild shipyard of Golara, the leaders of the Four Horsemen mercenary units of Earth have decided it’s time to take back the colonies the Merc Guild has captured, and the Horsemen split up to liberate them...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-travel
Storm Clouds by Chris Kennedy, Mark Wandrey
Rated: 4.50 of 5 stars
· 6 ratings
The Omega War ended, not with a bang, but with a whimper. The Peacemaker-enforced ceasefire brought an end to the hostilities, but not a resolution, and now it’s up to the Four Horsemen to forge a lasting peace...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-travel
Do No Harm by Robert E. Hampson, Chris Kennedy
Rated: 4.50 of 5 stars
· 6 ratings
When Todd’s critically damaged ship dropped out of hyperspace near the Human colony world of Azure, he had no memory of his past. He didn’t know who he was, or even what he was, and the Humans didn’t either. That didn’t stop the colonists of Azure—they took him in, anyway…even though they didn’t understand how he could do some of the things he could do...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-travel
Star Force: Phoenix by Aer-ki Jyr
Rated: 4.50 of 5 stars
· 6 ratings
Cal-com's journey is not at an end. In fact, it's just beginning..

Categorized as:
aliens colonization exploration invasion military space-fleet space-opera space-travel
Lucky Justice: Lucky's Marines | Book Seven by Joshua James
Rated: 4.50 of 5 stars
· 6 ratings
A simple mission gone impossibly wrong. Ambushed by an enemy that shouldn't exist, Lucky and his Marines must overcome powerful forces with limitless resources – and a princess with limitless ego. But Sergeant Lucky Savage has a powerful weapon of his own. Whether he can manage to control it is an open question...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-travel
Acheron Redemption by Ken Lozito
Rated: 4.50 of 5 stars
· 6 ratings
Sentinel warships were the answer to the Federation Wars. They brought peace and stability....or so they thought.The Sentinels are a menace, terrorizing spacers across the galaxy in their hunt. But change is coming, and spacers across the galaxy will have to choose whether to fight for their future or not...

Categorized as:
aliens colonization first-contact invasion military space-fleet space-opera action-adventure
Stardust by Edward W. Robertson
Rated: 4.50 of 5 stars
· 6 ratings
The invaders have arrived. The last battle for humanity is about to begin. STARDUST is the final book in the Rebel Stars series...

Categorized as:
aliens colonization exploration first-contact invasion space-opera space-travel action-adventure
Star Force: The Powers That Be by Aer-ki Jyr
Rated: 4.50 of 5 stars
· 6 ratings
In youth you'd lay awake at night and scheme..

Categorized as:
aliens colonization exploration invasion military space-fleet space-opera space-travel
Valkyrie's Daughter by John E. Siers
Rated: 4.50 of 5 stars
· 6 ratings
The alien Akara have a secret. They've discovered the location of a planet that is home to a primitive human civilization, another ancient "seeding" of the legendary Progenitors. But this planet lies in the territory of the Otuka, spacefaring alien predators who consider human flesh to be a delicacy and the planet to be their private hunting preserve...

Categorized as:
aliens colonization exploration first-contact invasion military space-fleet space-opera
The Lyons' Pride by Chris Kennedy, Marisa Wolf
Rated: 4.50 of 5 stars
· 6 ratings
No other Human is more enigmatic than the LyonOn the African savanna, the male lion is the lord who watches over his family, while the females of the clan do the real work.Joel, “The Lyon” Lyons thought that owning a mercenary company would be similar—he could sit back and allow the Lyoness to run the Pride...

Categorized as:
military space-fleet aliens invasion exploration first-contact space-travel colonization
Imperial Command by D.J. Holmes
Rated: 4.63 of 5 stars
· 11 ratings
Trapped behind enemy lines, the survivors of the raid on Jaranna have been forced to flee deeper into enemy territory. Behind them Karacknid fleets gather to exact revenge. With danger at every turn, Admiral Lightfoot must find a way to get his ships home or Earth will be left defenceless.On Earth the Empire has been formed and is bringing the outlying colonies into its fold...

Categorized as:
aliens colonization exploration invasion military space-fleet space-opera space-travel
Star Force: Origin Series by Aer-ki Jyr
Rated: 4.38 of 5 stars
· 8 ratings
The Origin Series is empire building at its finest, with 100 episodes and over 2.5 million words in the military science fiction serial detailing the rise of Star Force from corporate entity into an interstellar empire over the course of more than a millennium...

Categorized as:
aliens colonization exploration invasion military space-fleet space-opera space-travel

Delphi Challenge by Bob Blanton, Jessica Gurd

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