HIP - High Intellectual Potential

While cleaning Lille DIPJ station, Morgane Alvaro, housekeeper, with an IQ of 160, lets drop the file of the murder of Antoine Levasseur, found dead at his home. She can't help reading it and finds out that Jeanne Levasseur, his wife, missing since the day of the murder, is innocent.

A man is taking a bath in a hotel room when a stranger in a mask forces his head and drowns him under the water. This is Morgane's first case as a consultant for Lille DIPJ, with Kadarec's disagreement. She was reluctant at first, but accepted the post, subject to the reopening of the investigation of Romain's, her boyfriend, disappearance, which Hazan supervises.

A car drives into the forest with two scared girls trapped in the boot. The day after, Florence Grangeon reports the disappearance of Laura and Juliette Sorin, her 5 and 8 year old daughters, to the DIPJ in Lille. She and their father, Franck Sorin, had joint custody of the girls and he apparently is also missing.

The assistant of Fanny Mariani, veterinarian specializing in exotic animals, finds her dead on the floor in her clinic, the printer nonstop flipping sheets with the word "murder" printed on them. Although the coroner first favours natural death, Morgane suddenly realizes that the victim has been poisoned with a Phyllobates terribilis, a small yellow frog, missing from one of the animal cages. While on the inquest, Morgane asks her mother about Romain.

EMILIEN KERR is found near death, a plastic bag over his head. Paramedics manage to revive him at the very last minute. The victim lived alone. His only family is his daughter, who he was apparently supposed to meet that very same night.

ALEX VINIALI is found beaten to death on a football pitch, with a mysterious message stuffed in his mouth: «For Josepha.» Morgane shows up at the crime scene with Théa, who's shadowing her on a one-week internship.

A man's body is discovered on a beach. He's attached to a windsurfing board, apparently strangled by the rope. The victim, ALEX MAERTENS, was the head of the local sailing club. And spray painted onto the club's outer wall is the word: P-E-R-V-E-R-T.

PAULINE GARCIA, a 24-year-old professional ice skater, is found dead, run over by her own car. The sole witness to the murder: a blind young woman named EMILIE.