Raymond F. Jones 
Renegades of Time 

The Algorans. masters of time travel, had lost control of the time channels. In despair, they stood helplessly by as the barbarian hordes of the devastating Bakori were unleashed on the universe. In the little town of Midland, U.S.A., Joe Simmons worked feverishly to assemble the only device that had a chance to stop them. He knew that success depended on a beautiful Algoran woman, Tamarina, yet he didn’t even know if she would re-appear! This whole disaster was his fault.