Intelligence agents have uncovered something beyond belief, but the evidence is incontrovertible: the USA's greatest adversary is sending its own agents back through time! And someone (or something) is presenting them with technologies and weapons far beyond our most advanced science. We have only one option: create time-transfer technology ourselves, find the opposition's ancient source...and take it down!

Andre Alice Norton was an American writer of science fiction and fantasy, who also wrote works of historical and contemporary fiction. She wrote primarily under the pen name Andre Norton, but also under Andrew North and Allen Weston. She was the first woman to be Gandalf Grand Master of Fantasy, to be SFWA Grand Master, and to be inducted by the Science Fiction and Fantasy Hall of Fame.