The plot is based on two parallel events, with detective Steve Carella at the center. He is assigned a difficult case: the day before, millionaire Scott, the owner of a luxurious villa, hanged himself in a small windowless room, having locked himself in from the inside in a very clever way. At the same time, a woman named Virginia comes to the police station with the intention of killing Carella himself. After all, he once arrested her husband, who died in prison...