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……
Evading the police, Issa and her brother Tomas seek shelter in a secluded orphanage in the forest. But the siblings’ safe haven soon reveals itself to be a hellscape controlled by a sacrificial cult in thrall to a fearsome nocturnal deity.
A ghost at St. Vincent's College manifests yearly at the Virgin Tree on Valentine's Day, turning a symbol of yearning into terror and compelling a para-physicist to investigate its sinister origins.
每年情人节，圣文森特学院都会出现一个幽灵，在圣母树现身。它将象征相思的圣母树化作恐惧之源，迫使一位超自然物理学家着手调查其邪恶的起源。
Recurring nightmares and the aftermath of a violent break-up have put Leni on edge. As she desperately seeks to regain her sanity she must confront her monsters in order to unravel the trauma of a past she doesn't seem to fully remember.
