時空を超えたあらゆる時と場所に波動現象として存在する、ウィンストン・ナイルズ・ラムファードは、神のような力を使って、さまざまな計画を実行し、人類を導いていた。

Traumatized by the bombing of Dresden at the time he had been imprisoned, Pilgrim drifts through all events and history, sometimes deeply implicated, sometimes a witness. He is surrounded by Vonnegut's usual large cast of continuing characters (notably here the hack science fiction writer Kilgore Trout and the alien Tralfamadorians, who oversee his life and remind him constantly that there is no causation, no order, no motive to existence).

Dan Davis, an electronics engineer, had finally made the invention of a lifetime: a household robot that could do almost anything. Wild success was within reach, but then Dan's life was ruined. In a plot to steal his business, his greedy partner and greedier fiancée tricked him into taking the "long sleep": suspended animation for 30 years.

Ryland Grace is the sole survivor on a desperate, last-chance mission - and if he fails, humanity and the Earth itself will perish. Except that right now, he doesn't know that. He can't even remember his own name, let alone the nature of his assignment or how to complete it. All he knows is that he's been asleep for a very, very long time. And he's just been awakened to find himself millions of miles from home, with nothing but two corpses for company.

三百万年前の地球に出現した謎の石板は、原始的な道具も知らないヒトザルたちに何をしたのか。月面で発見された同種の石板は、人類に何を意味しているのか。