The story involves the discovery of an incredible book, the powers of which allow the hero to travel from Earth to any of a hundred different worlds. But only one holds his interest, as it is to that world he must travel to find his grandfather, who had mysteriously disappeared. Arriving through time and space he is told by five "beings" he must fulfill a mission (about which he was supposed to have agreed to on Earth, but which he in fact knows nothing about) to end the "darkness" he will find himself in. He is not alone in his quest that takes him into battles in space and on alien planets, but to succeed, and to obtain the love he so desperately seeks, he must travel back and forth through the powers of the book, not knowing if "time" will continue to be his staunch ally or become his bitter enemy.