Looked at from the outside, the annual summer camp in the countryside seems idyllic. But for Kenny, a boy with a Samurai soul, it is no more than a prison camp, run by a sadistic woman who is sometimes helped by her salacious son, Christian. To escape the adults, Kenny and his "samurai" friends sneak out to the forest to build a secret castle. It's off-limits to the girls, but a female camper named Kerstin begs Kenny to show her the castle. But...