The Inner Planets Trilogy: Similar romance series

The Long Winter

by A.G. Riddle

4.19 · 87 ratings

apocalyptic · audiobook · dystopia · suspense · post-apocalyptic · book · technothriller · sci-fi · aliens · fiction · action-adventure · hard-sci-fi · mystery · survival · space · adult · violent-conflict · war · contemporary · paranormal

All books in this series ❯

Ilium

by Dan Simmons

3.99 · 82 ratings

sci-fi · adult · violent-conflict · war · fiction · book · classics · space-opera · epic · historical · historical-fiction · horror · gods · hard-sci-fi · action-adventure · robots · ai · literary · mars · cyberpunk

All books in this series ❯

Ice Planet Barbarians

by Ruby Dixon

3.94 · 1205 ratings

aliens · paranormal · adult · fiction · romance · sci-fi · steamy · book · barbarians · fated-mates · humor · new-adult · audiobook · space · contemporary · multi-pov · alpha-mc · action-adventure · violent-conflict · insta-love

All books in this series ❯

NASA Trilogy

by Stephen Baxter

3.76 · 61 ratings

fiction · space · sci-fi · space-travel · adult · hard-sci-fi · alternate-history · exploration · audiobook · myths · post-apocalyptic · book · 20th-century · historical-fiction · historical · action-adventure · paranormal · suspense · mystery · mars

All books in this series ❯

Isaac Asimov's Caliban

by Roger MacBride Allen

3.96 · 51 ratings

adult · fiction · mystery · law-enforcement · book · robots · sci-fi · action-adventure · hard-sci-fi · classics · technology · literary · space-opera

All books in this series ❯

The Saga of Seven Suns

by Kevin J. Anderson

3.89 · 144 ratings

book · audiobook · adult · space · sci-fi · space-opera · fiction · violent-conflict · aliens · action-adventure · war · military · epic · drama · hard-sci-fi · male-author · colonization · family · box-set · robots

All books in this series ❯

Mass Effect Novels

by Drew Karpyshyn

3.58 · 78 ratings

adult · space · sci-fi · space-opera · fiction · aliens · action-adventure · military · audiobook · violent-conflict · space-travel · exploration · comics · book · male-author · cyberpunk · dystopia · futuristic · hard-sci-fi · litrpg

All books in this series ❯

Doom Star

by Vaughn Heppner

3.92 · 104 ratings

dystopia · genetic-engineering · space · galactic-empire · colonization · post-apocalyptic · invasion · book · military · space-fleet · adult · violent-conflict · soldiers · sci-fi · space-opera · fiction · action-adventure · aliens · space-travel · exploration

All books in this series ❯

The Phoenix Project Duet

by Candice M. Wright

4.20 · 57 ratings

genetic-engineering · contemporary · paranormal · book · reverse-harem · romance · adult · polyamory · fiction · fantasy · medical · military · new-adult · action-adventure · crime · friends-to-lovers · dystopia · enemies-to-lovers · supernatural · urban-fantasy

All books in this series ❯

Oath Forger

by Nia Mars

3.95 · 61 ratings

reverse-harem · polyamory · space · alpha-mc · adult · dystopia · sci-fi · paranormal · female-mc · royalty · fiction · aliens · romance · futuristic · post-apocalyptic · book · new-adult · space-opera · apocalyptic · steamy

All books in this series ❯

Alien Hunters

by Daniel Arenson

3.87 · 32 ratings

colonization · action-adventure · super-powered · aliens · invasion · exploration · fiction · book · military · violent-conflict · space · space-fleet · adult · sci-fi · space-travel · space-opera · humor · galactic-empire · mlm · supernatural

All books in this series ❯

Fire Planet Warriors

by Calista Skye

4.03 · 36 ratings

aliens · exploration · fiction · paranormal · invasion · romance · book · sci-fi · space-travel · first-contact · violent-conflict · adult · poc-mc · action-adventure · steamy · soldiers · military · humor · survival · warriors

All books in this series ❯

Paranormal Investigator

by Jillian Stone

3.48 · 25 ratings

sci-fi · vampires · ghosts · supernatural · shapeshifters · book · steamy · urban-fantasy · romance · paranormal · fiction · action-adventure · mystery · witches-wizards · industrial-era · steampunk · historical · adult · magic · historical-fiction

All books in this series ❯

The Janus Group

by Piers Platt

3.99 · 34 ratings

political-intrigue · space-opera · sci-fi · suspense · adult · cyberpunk · space · book · fiction · action-adventure · dystopia · violent-conflict · military · audiobook · espionage · mystery · assassins · conspiracies · genetic-engineering · soldiers

All books in this series ❯

War Wolves

by Jonathan Yanez

4.20 · 20 ratings

space-fleet · invasion · book · colonization · aliens · exploration · fiction · soldiers · sci-fi · space-opera · space-travel · military · first-contact · space · violent-conflict · adult · action-adventure · galactic-empire · genetic-engineering · supernatural

All books in this series ❯

Brides of Driegon

by Ava Ross

4.30 · 46 ratings

romance · paranormal · fiction · aliens · adult · sci-fi · anthologies · shapeshifters · action-adventure · book · dragons · poc-mc · fated-mates · contemporary · humor · historical · new-adult · supernatural · kind-mc · kidnapping

All books in this series ❯

Greatwinter Original Australian publication order

by Sean McMullen

3.98 · 23 ratings

book · fiction · sci-fi · adult · industrial-era · steampunk · historical · apocalyptic · literary-fiction · action-adventure · post-apocalyptic · classics · literary · dystopia · survival · lgbtq · hard-sci-fi · futuristic · politics · space-opera

All books in this series ❯

The Survivors

by V.L. Dreyer

4.07 · 28 ratings

apocalyptic · horror · adult · dystopia · paranormal · zombies · sci-fi · fiction · futuristic · post-apocalyptic · book · survival · action-adventure · romance · poc-mc · on-the-run · sad · contemporary · suspense · coming-of-age

All books in this series ❯

Preyfinders

by Cari Silverwood

3.78 · 18 ratings

romance · steamy · paranormal · aliens · fiction · sci-fi · adult · dark · bdsm · book · fated-mates · action-adventure · violent-conflict · captivity · invasion · anthologies · contemporary · sexual-assault · magic · angst

All books in this series ❯

SGX

by Sally Malcolm

4.05 · 20 ratings

adult · space · sci-fi · fiction · action-adventure · book · aliens · anthologies · horror · contemporary · paranormal · suspense · space-travel · mystery · time-travel

All books in this series ❯