The body of Gloria Severini is found on the floor of her living room by the cleaning lady. When Valeria arrives at the crime scene the victim's 20 year-old son can't be found. But is he really guilty?

An ordinary administrative case: a man has been run over on the highway by a hit-and-run driver. There would be no need for Valeria, but Inspector Ferro understands right from the start that things aren't as simple as they seem.