On the Italian-French border a body is found by two French technicians: "frightened", they move it to Italian territory. Rocco senses the anomaly and decides to "return" it to the French.
Sebastiano, Rocco's friend, is a source of great stress, but he also has to deal with the death of Martinet, a well-known Leonardo scholar. Many thoughts for Rocco, in which there is also Sandra.
Despite the mistake made on the case of Professor Martinet's murder, Rocco resumes the investigation with determination. Journalist Sandra Buccellato finds important information.
Schiavone decides to help his newfound friend Sebastiano cross the border into Switzerland, hunting for Enzo Baiocchi, but Baiocchi precedes them and contacts the Public Prosecutor. Baldi for a meeting.