一群男女来到五百年前的城堡观光，接着三个人离奇失踪，剩下的人发现城堡的机关能通往一个迷宫密道，然后他们下去搜寻，却一个挨一个死去，而城堡的伯爵似乎有所秘密隐藏，于是他们开始互相猜忌，到底是狼人的诅咒还是人为。
Six people bound together by a traumatic experience decide to round off a year of group therapy in style. They join each other once more, traveling up to the Scottish Lowlands for a reunion weekend in a 1970s holiday let. Soon a number of mysterious and horrifying events start to expose the cracks in their relationships, and one by one they discover that trust runs but skin-deep. A night of closure turns out to be far more final than they could have anticipated.
