When a mob family takes over an amusement park after the owner dies under mysterious circumstances, the recently-fired clown mascot seeks vengeance for the loss of his job.

Psychotic Angela is itching to do what she does best: slaughter dozens of teenage campers. As luck would have it, the previous site of her murders has been renamed and converted into an experimental summer camp meant to bring together privileged and lower-class teens. On the day the youths are boarding the buses to camp, Angela runs over a potential camper with a garbage truck and assumes her identity. Once she has infiltrated the camp, the real terror begins.

一起轰动伦敦的离奇凶杀案！
赫赫有名的金矿大王的妻子头部中弹，惨死在人迹罕至的雷神桥上，她手中坚攥着的纸条，表明其死亡与丈夫新近聘请的妙龄女家庭教师有着莫大的干系。而最让福尔摩斯困惑不解的是桥栏杆上一道奇怪的凿痕…