The Gamma Recruits by James Pelkmans
Jayson Reilly thought his research could save the world. He never dreamed it would be used to take over another one. Sent to a parallel Earth a thousand years in the past, he discovers his role in a horrifying plot to create a private paradise meant only for a select few. But what can he do to stop it? He and his colleagues are no match for the mercenaries sent to keep them under control. Armed with only their wits and the limited technology they've brought with them, Jayson and his fellow recruits must find a way to fight back.
Book Length: Long Novel - 320-650 Pages