Episode list

While investigating the stabbing of Stéphane Maury, Boris and Constance must face Procureur Quiring's early retirement to live with Milena in Russia, Solène's three-month course in Paris and Antoine's marriage troubles with Rebecca.

Lucie Gautier, a perfume manufacturer, is found dead in her home by her son Victor, her throat slit. The night before, he overheard her and Elisa, her associate, arguing about a meeting with an investor that her mother inexplicably did not attend. The investigation reveals that Lucie was living under a false identity.

Florian Dillon, an extreme climber, is attacked with one of his ice axes and found by girlfriend Natasha Pasquier, but dies in hospital. He was preparing his next challenge, which would be transmitted live on the internet. First suspect is his sponsor Hugo Thenin, with whom he had differences about the future of his career, that was declining. Barth and Constance face the news about Antoine's divorce.

A group of people are looking for Hugo Albin, who has vanished in the woods, to finally find him dead by a blow on the back of his head with a branch. They were following a course to embrace nature, which Hugo, a former drug offender, was imparting, although the group was starting to suspect of his abilities as a instructor after Mr. Martineau became intoxicated with poisonous berries, which Hugo apparently told him he could eat. Tension was created among the attendees. One of them, Sylvain Poncet, becomes the prime suspect and is arrested

Constance's birthday is coming and Barth will try to fulfill her desire of gathering the family together for the celebration.. Meanwhile, she and Boris have a new case: Manu Cana, death by a fall from a window in the dry dock near his father Christophe's home, with whom he had a difficult relationship. Manu worked as a fashion designer and as per his girlfriend Eline he was into drugs.