Adult 18+ sci-fi books

30978 books

How to Seize a Dragon's Jewel
How to Seize a Dragon's Jewel
Cressida Cowell
PG-13
Path of Stars
Path of Stars
Erin Hunter
PG-13
Wilf the Mighty Worrier and the Alien Invasion
Wilf the Mighty Worrier and the Alien Invasion
Georgia Pritchett
PG-13
Sector Seventeen
Sector Seventeen
S. J. MacDonald
PG-13
Reishi Adept
Reishi Adept
David A. Wells
PG-13
Sprockets: A Little Robot
Sprockets: A Little Robot
Alexander Key
G
The Penetrators
The Penetrators
Hank Searls
PG
Explosive Negotiations
Explosive Negotiations
Michael Anderle
R
Three Kings
Three Kings
John Schettler
PG-13
Captain Cobwebb
Captain Cobwebb
Gordon Boshell
PG-13
Drowning Fergus
Drowning Fergus
Addison Lane
PG-13
The Secret Empire
The Secret Empire
Paul Genesse
PG-13
The Para-Portage of Emily
The Para-Portage of Emily
Muffy Wilson
PG-13
Megastar
Megastar
Ciaran Murtagh
PG-13
Ethan
Ethan
Rae Rivers
PG-13
Knee-Deep in Thunder
Knee-Deep in Thunder
Sheila Moon
PG-13
Locadio's Apprentice
Locadio's Apprentice
Chelsea Quinn Yarbro
R
Shock Wave
Shock Wave
Walt Richmond; Leigh Richmond
PG
Galactic Battle
Galactic Battle
Zac Harrison
PG-13
Fellengrey
Fellengrey
Scott Thomas
PG-13
Second Sight
Second Sight
Sherry D. Ficklin
PG-13
The Battle Immortal
The Battle Immortal
Karen Azinger
R
The Piercing
The Piercing
Helen McCabe
PG-13
The Luminous Depths
The Luminous Depths
David Herter
PG-13
Boogers from Beyond
Boogers from Beyond
M. D. Payne
PG-13
The NSA Files
The NSA Files
Terry Persun
PG-13
Compass Reach
Compass Reach
Mark W. Tiedemann
PG-13
Clash of the Rival Robots
Clash of the Rival Robots
Gareth P. Jones
PG-13
The Bump on Brannigan's Head
The Bump on Brannigan's Head
Myles Connolly
PG-13
Blood and Iron
Blood and Iron
Harry Turtledove
PG-13