一群大学生在四月一日愚人节结伴到一无人荒岛的巨宅中度周末,结果碰上血腥的愚人节恶作剧。他们在互相玩笑之余却逐一被杀,而邀请他们前来的富家女莫菲圣琼却始终未露面,这到底是什么回事?影片明显地采用了艾嘉莎克莉丝蒂的侦探名著《十个小印第安人》的故事模式,让剧中人一个一个被杀A group of eight college friends gather together at an island mansion belonging to heiress Muffy St. John to celebrate their final year of school. They soon discover that each has a hidden secret from their past which is revealed, and soon after, they turn up dead. Yet, are they really dead? Or is it just part of some very real and cruel April Fool's jokes? The hostess, Muffy, is the only one who apparently knows what's going on. But then again, is it really her doing the killing?