The story sees after a young man transferred from juvenile to adult prison, where he is taken under the wing of both Australia’s most despised criminal, and a soon-to-be-a-paroled inmate. A paternal triangle grows between them, suggesting that even the worst of men may have a little bit of good inside them — that will be their eventual undoing.
朱莉（詹妮弗•洛夫•休伊特 Jennifer Love Hewitt ）和其他三个中学生在毕业之际来到一个美丽的海滨城市, 开始了一次狂欢式的度假。怎料乐极生悲，四人在黑夜的公路上飚车撞死了一个路人。慌乱中他们决定把尸体抛入大海，并约定对此事守口如瓶。一个快乐的旅程以阴霾结束。
本以为一切都成为秘密。朱莉开始了她全新的大学生活。但是一封来信却打破了她的平静。里面赫然写着“我知道你去年夏天干了什么”，朱莉惊恐万分。果然，恐怖异样的事件开始发生在几个年轻人身上，他们推测凶手是谁，猜疑纷纷，然而血腥的结局早已在等待着他们……
