Mr. Garrone, an equivocal architect, was murdered by Santamaria, the police commissioner. A series of inquiries soon brings him into elite society in Torino. In the midst of his suspicions of Anna Carla, Santamaria falls in love with her. A platonic friend of Anna Carla's, Massimo, is in a relationship with Lello. He's taking a different path to get to the bottom of things, and it's causing confusion for the officer. However, another murder occurs...