家庭欢乐度假瞬间急转失控！女儿托妮与好友出海垂钓，渔船突发损毁，众人被困狭小划艇在汪洋漂流。嗜血鲨群迅速合围，在小艇周边不断盘旋，死亡危机步步逼近。岸上父母闻讯万分焦急，争分夺秒跨海奔赴救援，与鲨群竞速，拼命赶在鲨鱼撕碎小艇前救出被困的孩子们。

On Summerween, a former circus clown escapes a mental institution to return to his abandoned mansion and hunt the teens partying there.