The Gamma Recruits (Countdown to Epsilon, #1)

Jayson Reilly thought his research would save the world. He never dreamed it could be used to take over another one.

Sent to a parallel Earth a thousand years in the past, Jayson believes he’s part of a mission to save humanity from certain disaster. But something is wrong. What he finds waiting for him doesn’t match the historical record, and he soon realizes he and his fellow scientists are not the first arrivals from their world.

Who was the mysterious visitor from the past, and what was his purpose? By the time Jayson learns the horrifying truth, it’s too late to turn back.