From back of book: "A master of science fiction creates his most ingenious and exciting adventure. A young man finds he has extrasensory talents. Then he discovers others have them, too--though few as powerful as his. And then comes an appalling discovery: he finds that if he cannot master these psi powers he will certainly go mad. And no one ever has mastered them.

His desperate battle to find the secret of the Power leads him to a source utterly alien--and awesome in its implications for Earth's fate..."