Decades ago, a pair of young siblings were brutally murdered in their own cabin. The only possible culprit was a boarding student who was on vacation there at the time. However, due to insufficient evidence, the students were not convicted in the end, and the cabin case became an unsolved cold case. The detective Carl (Nikolaj Lie Kaas) who was in charge of the case at the time was also devastated. This suspicious case became a heartache for him. In a blink of an eye, decades later, the boarding students of that year have grown up and are active in the upper class. Although they are well-dressed and elegant, in fact, their twisted minds have long turned these people into beasts, and they can only get pleasure from killing. When Carl picks up the old unsolved case, danger is approaching him and his family step by step.