HPI - Season 1

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. PJ finds out that Morgane has been messing around with the Levasseur files and Commissaire Hazan, being pressed by her superiors, ask her to help them with the investigation and the disappearance of Jeanne Levasseur. Commandant Karadec is then obliged to collaborate with Alvaro.

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. The PJ discovers that the name of the decease was Benjamin Winckler, he was a regular in the hotel bar and that he was having an affair with Gladys Puger, a Doctor in her 40, who was the last person to see...

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. Arnaud, the grandfather and wealthy owner of a luxury hotel chain, considers Franck a marginal follower of collapsology theories, trying to live on a eco-responsible farm. He is the ideal suspect in their probable kidnapping for his father-in-law.

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.

While walking his dog, someone tries to kill Emilien Kerr, 62, by suffocating him with a plastic bag, but the concierge of his apartment finds him in the parking lot and the emergency services keep him alive although he stays in a deep coma. Kerr was a widower, a loner who worked as German translator, leading a calm life, but Alvaro finds that he had been set up. Apparently he had had dinner with his daughter Alexia, 29, ten years after his wife's suicide, of which she accused him. Alexia becomes main suspect, while another daughter visits Emilien in the hospital.

Alex Viniali, 46, divorced, estate agent and amateur football player, is found dead in a football locker room. The investigation reveals that he was also a member of a group of Lille hooligans, who had recently had a fight with a rival team. While Morgane gets her 15 year daughter Théa to do the internship of 3rd grade at the DIPJ, Commandant Karadec is troubled by a sexy dream with Morgane.

The body of Axel Maertens, 32, sailing and kitesurfing instructor and manager of the nautical club at Malo-les-Bains, is found suffocated with a rope on a beach, presumably by accident. Morgane notices that the knot was not tied by a sailor, such as Axel, which means it was a murder. A certain Jonathan, who at first declared to have witnessed the murder, finally confesses that he committed the crime, a situation that makes everyone feel relieved, but that Morgane and Karadec find hard to believe. They join forces to continue with the investigation.

The PJ attends to the murder scene of Pauline Garcia who has been run over and crushed by her own car. The team is happy to know that a witness may have met the murderer, but unfortunately they find out that she is blind. Pauline was an accomplished ice skater, selected to participate in the following Olympic games with the national team so the first investigations lead Kadarec and Alvaro to the ice rink where she used to train to interrogate her possible rivals.