Adult 18+ sci-fi books

Klystar

Tamarisk

The Heart of Mars

Future History: The Coming Past

Sings With Stars

Dark Moon Seasons

The Dark-Haired Man, or, The Hieromonk's Tale: A Romance of Nova Europe

Esias: Remnants of the Past

Dark Moon Harvest

Code of the Brethren

Kundalini Conspiracy

In Exile

The Heritage of Terra: The Obligation: First War

While We Sleep ... the Dream Snatchers Cometh!

Get Out of My Mind

Buggy Crenshaw and the Deadwood Principle: Revolution!

Cyberius III

The Star Spangled Crunch

The Hidden Diary

The Last Secrets

Secret Eyes

Einar and the Myrtledale Conspiracy

Mind Over Psyche

Mind Over Psyche

Dark Moon

Outer Darkness

The Word of Teregor

The Pirate's Daughter

The Cold Heart of Summer

Have Frog, Will Travel