Far Shore of Time

When the Horch set free the copy of Dan Dannerman they'd been holding on one of their worlds, little did they realize that he would soon lead an attack on the Beloved Leaders. The attack not only succeeds, but gives Dannerman control of technology previously known to the alien enemy.Returning to Earth, it's up to Dannerman -- all three of him -- to figure the ins and outs of the alien technology in time to stave off the imminent destruction of Earth.Wrapping up what promises to be a classic science fiction series, Frederik Pohl proves his mettle as a Grandmaster.