The Crystal Series science fiction action adventure books by Doug Cooper

I like stories about people, and I particularly enjoy it when these people are engaged in adventures with aliens, spies, artificial intelligence, romance, and battles in space. The Crystal series books are futuristic thrillers of action and adventure that include all elements from the list above. Read them to enjoy engaging characters, pulse-pounding action sequences, and plot lines with surprises. Crystal Deception is the first full-length book in the series, and Crystal Conquest continues the exciting story line as Earth's heroes prepare for a world-ending invasion by alien forces. Crystal Horizon is a short prequel to Crystal Horizon that serves as a series sampler for new readers who want to learn more.