大学のミステリーサークルの学生たちは、前年に陰惨な連続殺人事件が起きた島を訪れることにした。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. [Locked Room International]