A year after his Bordeaux detectives team was disbanded having a serial killer exposed, French national police captain Martin Bernier arrives in a mountainous village near the sea. As accidental near-witness of a fatal shooting, he rescues a baby from a car on a cliff and meet competent lieutenant Lucas Auriol, who has no idea Bernier may postulate to become his beheaded's team new boss.

Martin Bernier's first case as captain in charge at Alpes Maritimes is a call from a woman who is locked up in a car, but when it's traced, the team quickly finds the senior female corpse in the trunk didn't call, unlike her missing younger companion. The case quickly complicates, with blackmail, queer infidelity and foster placement debacle.

Leslie Sorel, 17, flirts with Raphaël Costello at a beach bar. When he tries to force her, she flees through one of his house windows. Meanwhile, a driver tries to restart his vehicle again unsuccessfully and the body of a gendarme falls on his roof from an elevated street. Leslie peeks over the wall above the scene and scapes.

A young couple, fans of actress Magali Portier, visit the abandoned castle where her first film, "The Blood of Bluebeard", which launched her to stardom, was shot. In one of the rooms, recreating the end of the film, three bodies hanged by the neck: two of them, mannequins, but the third is Magali's corpse, dead to a blow to the temple.

Commandant Angelie attends the presentation of the new products of Huiles Alfonsi at the family house. Vincent Farnese, CEO, tries to convince her and friend Léo Grasset to press their olives at Alfonsi's olive mill. Shortly after, Farnese tells girlfriend Catherine Alfonsi, he must leave to see his sick mother. Three hours later, Pascal Mergault, friend of Farnese's, returns home.

Microlight pilots spot the body of a naked man, lying face down. Around him, the undergrowth was burnt in strange concentric circles. Dispatched to the scene, the research unit gathered surprising evidence. The victim, Laurent Keller, was a member of a group of ufologists. The witnesses are convinced: he was killed by extraterrestrials.