The commissioner's office is destroyed by a parcel bomb. Ardenzi, temporarily in command because Corsi is at the bedside of Paolo, who was seriously injured in the explosion, manages to identify the blonde woman who sent the parcel. A group of boys steal valuables and destroy the home of a classmate, who is also a member of the gang. The group forces him to participate in the robbery of the family jewelry store. But he confides in a classmate.