While maintaining order at the city stadium, Coliandro and Officer Balboni arrest a football fan who had tried to stab a policeman. Terrified by the thought of ending up in prison, the boy cooperates and provides the police with some important information.
Officer Gargiulo shows up at Coliandro's house in the middle of the night, drunk and with a bloody knife in his hand: the inspector tries to reconstruct what happened, but it doesn't seem easy.