World of Ptavvs

Thrints plunder and enslave lesser planets, and one of them, Kzanol, has spent two billion years trapped on Earth in a time-stasis field. The telepath Larry Greenberg, tapping Kzanol's mind in the interest of science, learns which planet he has in view. Niven's first novel grew from a shorter version in Worlds of Tomorrow. This 1975 Ballantine printing has Rick Sternbach's cover and Bonnie Dalzell's art inside.