A group of people are killed one by one while participating in a million-dollar treasure hunt in an Italian castle. The murders seem to have no connection, but they all share the same trait: they are all descendants of a powerful family. The first victim is a young woman who was killed by a mysterious figure wearing a mask. The second victim is a man who was stabbed to death by another unknown person. The third victim is a woman who was strangled with her own garters. As the investigation proceeds, it becomes clear that the murders are not random acts of violence. They are carefully planned and executed by someone who has access to the castle's security system. The killer seems to be using the treasure hunt as a means to gather information about the families involved. As the investigation continues, the team discovers that the murders are connected to a long-standing feud between two powerful families. The first family is known for their wealth and status, while the second family is known for their cunning and deceit. The killer is revealed to be a former member of the first family, who had been exiled from the castle for his crimes. He has been living in hiding ever since, but he has managed to stay one step ahead of the police. With the help of the team, the killer is finally caught and brought to justice. The final victim is the last family member left alive, who is killed by the killer himself. In the end, it is clear that the murders were not just random acts of violence. They were carefully planned and executed by someone with a twisted sense of revenge. And when the truth is uncovered, it becomes clear that the killer was not just a criminal, but a true psychopath.