16 years later, Tanguy, now 44, returns to his parents' house with his daughter Zhu under his arm because Meï Lin left him. Disappointed to see their "little one" in this state, Paul and Edith do everything to give him a taste for life, without realizing that by doing so, they braid the rope to hang themselves. Because Tanguy is starting to feel good with his parents.

Three years after a young girl’s disappearance during a trip to Norway, her passport resurfaces in Greenland. Without telling anyone, her 17-year-old sister embarks on a quest to solve the mystery of her disappearance. Torn between the hope of finding their first daughter and the fear of losing their second, her parents, though separated, set off together for Greenland.

Off the coast of Montpellier, a diver exploring a wreck uncovers a highly sought-after treasure: a golden statuette of Medusa, the monster from Greek mythology. The day after his discovery, the young man's boat is found adrift, with no one on board. Has the curse surrounding the legendary statue struck again? Or is a rival treasure hunter behind the diver's disappearance? - It's up to Police Captain Guillaume Le Guen of Montpellier's regional crime squad and his brother, Gendarmerie Captain Damien Le Guen, to solve the mystery. There's no time to waste and they'll need all their investigative skills, particularly because the victim is none other than Thibault Gagneur, Guillaume's son-in-law, whose daughter Emilie is expecting his grandchild.