Research Unit - Season 9 (2015)

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Michaël Varèse, 38, is found dead in his home, strangled and tied to his bed. Commandant Nadia Angeli remembers that she saw him the day before with Adjudant Sara Cazanova. Apparently, Varèse was having an affair an had a dispute about it with his wife, Audrey. Cazanova becomes the number one suspect when her phone is found at the crime scene and she is nowhere to be found. At the same time, Lieutenant Juliette Delage arrives from Paris to follow a lead in an old case. Lieutenant Roxane Janin recovers from her injuries and has some news that will surprise the team.

Leslie Sorel is being chased in the forest by a stranger and falls in a trap. The SR is investigating a gas explosion in the kitchen of a home where Christophe Médioni, a 32-year-old, is found dead. All evidences point to suicide. At the same time, Ariane Dugay informs Capitaine Bernier that her daughter is unreachable since the day before. When Lieutenant Lucas Auriol finds Leslie's bag and jacket near the explosion, Bernier begins to worry about her adopted daughter.

Martin and Lucas go fishing on the former's boat, but find a diver drowned in the water. They approach a nearby boat with no one on board; in the cabin, documents of diver Sonia Lalande, a nurse, and a map with a mark at Pointe du Lion; scuba bottles marked "La sirène bleue", a local diving club. Nadia confirms death by drowning, but remains show drowning occurred on board in a washbasin full of water. Étienne Porchet, owner of "La sirène bleue" confirms that Sonia had sailed in his boat the day before with Fabien Deville, one of his monitors and also her boyfriend. ...

At a fun fair, a teenager, Gladys, takes a girl hostage to supposedly save her from a suspicious man. When commandant Angeli, present on the scene, tries to calm her down, she menaces to kill the girl with a bloody knife. Nadia finally manages to calm her down, makes her release the little girl and reassures her. Gladys is terrified, and claims to have seen her mother fainting in her bedroom, with blood on her face, but when asked where she lives, she no longer remembers. Capitaine Bernier and the group must hurry to try to find her alive, but have little clues about ...

The mayoress of a tiny shepherds village is murdered, her corpse laid out for wolves to devour. Her election ended the long reign of an Italian family which champions the opposition against her reintroduction of wolves from Italy. She just welcomed as paying guest famous novelist Pauline Domergue, whom inspector detective Lucas Auriol admires, yet she asks an inside interview from captain Martin Bernier. She's part of secret relationships the team must untangle; including the mayoress's stifled straights AAs step-son Sebastien, who mistook her scorned lover for a ...

The idealistic heir of a firm he recently became CEO of is killed during a paintball team duel by a real bullet. The cops question everyone, including startled just-retired, more pragmatic father George, to work out private or professional motives and opportunities among the members of both teams as well as loved-ones.

Shortly after a celebrated astronomy professor's latest public lecture at the Nice observatory, his corpse is found. It's a staged suicide hanging at the site where, as a letter explains, he got a way with a fatal car crash years ago. The first victim is related to several people in the present victim's life, making them suspects.

One night Nadia awakes by noises and tries to find evidences, unsuccessfully. She confesses Léo she fears she may be losing her mind. Léo attributes it to overwork and decides to celebrate Nadia's birthday earlier. Next day, Martin receives a call saying Nadia is dead. Nadia's house id wide open and things upside down, her corpse in bed with several shots. Shocked by the scene, the brigade hears Léo arrive and try to prevent him from entering, but Nadia is with him. Léo and her realize with horror the victim is Magalie, cousin of Leo's, staying at her house during ...