Renegades of Time — Raymond F. Jones

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.

Raymond F. Jones was an American science fiction author. Between 1951 and 1978, he published sixteen novels and dozens of stories. He is best known for his 1952 novel, THIS ISLAND EARTH, which was adapted into a critically acclaimed 1955 film.