Aliens threaten Earth.
Our best weapon is the super AI they’ve come to steal.

Classic Sci-Fi Series. Futuristic Thrills.
The Crystal Series is four full-length books of action and suspense where the emergence of self-aware AI and alien first contact occur at the same time.

The Characters
Criss is a four-gen AI with the cognitive ability of a thousand humans. Hard-wired to protect and support his human leadership, Criss serves Juice Tallette, the crystal scientist who created him; Cheryl Wallace, captain of the Fleet space cruiser Alliance; and Sid, a covert spy for the Defense Intelligence Agency.

Purchase Link:  Amazon for Kindle & Paperback

The Books

Crystal Deception (Book 1)  goes full throttle when alien aggressors—determined to take Criss for themselves by any means necessary—present a mortal threat to Earth. The team fights to protect Criss and repel the invaders, and in the process discover why they forever will be joined in a powerful alliance.

Crystal Conquest (Book 2) continues the adventure begun in Crystal Deception. The aliens are down, but by no means out. And this time they return for revenge. Led by a powerful AI Goliath, the aliens are determined to vanquish Earth. Can the team stop them before it’s too late?

Crystal Rebellion (Book 3) takes place on Mars where the action centers on three AI crystals left behind after the last alien invasion of our solar system. Join the adventure as the team struggles to save humanity, and soon realizes they need to save themselves.

Crystal Escape (Book 4) ramps the excitement as an alien AI eludes capture and breaks for her home world with information that compromises the security of Earth. Can the team stop the alien being and rescue the hostages before they are lost to the boundless depths of interstellar space?

New Series – Bump Time Origin
Time-Travel Suspense!

Teaming up with a smart AI and duplicates of himself, a time traveler races to save his lover, who will soon die if he cannot find a way to change her future.

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Free Book for Newsletter Subscribers

Crystal Horizon is a free gift for newsletter subscribers. This mini-adventure is a perfect treat for fans to reconnect with favorite characters, and a great stand-alone story for new readers. Sign up and receive the download link.



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I’d Love to Hear From You
Contact me at doug(at)crystalseries.com and let me know what’s on your mind.

Happy reading!

Doug J. Cooper

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Time-Travel Suspense

“Had a blast reading”

“Insanely great”

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carnival roller coaster”

“Science fiction
done right”

“I can’t remember
the last time I enjoyed
a book this much!”