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孤島に建つ十角形の奇妙な館を、大学のミステリ研究会に所属する7人が訪ねる。 この館を設計した中村青司（なかむらせいじ）は、半年前に謎の焼死を遂げていた。 そして、凄惨な殺人劇が、幕を開ける――。 Students from a university mystery club decide to visit an island which was the site of a grisly multiple murder the year before. Predictably, they get picked off one by one by an unseen murderer. Is there a madman on the loose? What connection is there to the earlier murders? The answer is a bombshell revelation which few readers will see coming.