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.六人因创伤经历结合在一起，决定结束一年的集体治疗。他们再次相聚，前往苏格兰低地，在20世纪70年代的假期里重聚一个周末。很快，一些神秘而可怕的事件开始暴露他们关系中的裂痕，他们一个接一个地发现信任在运行，但却是肤浅的。闭幕之夜的结局远比他们预想的要大得多。