The Nipe, a monstrous alien who ""cats like a shrew"" and leaves only raw bones (of men) behind, comes down on the third planet. Very special surgery creates a superman grafting and fusing a twin identity and the Stanley Martin who was Mart and Bart Stanton succeeds in finally coming to peaceful terms with the Nipe.... A genetic gambit with some gruesome, some confusing (the mutation of names), some exciting moments.