一所英国寄宿学校附近的水力压裂地出现了一个神秘陷坑，被释放出的恐怖力量令整个学校变成了一个血腥的杀戮战场。。The story of a girl who, in an attempt to understand the mysterious suicide of her younger sister, embarks on a dangerous game, hoping to stop the curators of the "death group" pushing teenagers to suicide.。