Marco, Simone and Ale are three youngsters from Rome who get their hands on the keys to a luxury home. They decide to spend the weekend there while the owner is away. But then the unexpected happens: the owner, Marquis Lanzi, returns early after his car breaks down. Simone witnesses a horrifying scene: Lanzi is torturing a young girl. Simone tries to free her but Lanzi catches him, chains him up and starts torturing him, too. Marco and Ale hear the cries coming from one of the basement rooms. They rush to the room and try to kill the marquis but the man manages to get away. The four boys try to flee the house. Little do they know that the marquis is still there, lying in ambush.