Research Unit

Brilliant airline captain Charlène returns early from her latest flight to an empty home. Her husband Geoffrey and their son Rodolphe have vanished. Soon after, Geoffrey's body is found in the nearby woods, but Rodolphe is still missing.

During a murder mystery game set in a historic fort, Cécile Adam is found murdered in a secluded courtyard. Every participant appears to have an alibi. As the RU investigates, they uncover a web of secrets hidden in the victim's private life.

The body of student Vanessa Pelletier is found on a beach on the French Riviera. As the RU investigates the prestigious campus she attended, they discover that the young woman had been leading a secret life, sending the investigation in an unexpected direction.

Thomas Lemoine is found shot dead at a virtual reality therapy center. After rescuing a young woman from a deadly fire, he unexpectedly began a relationship with her. But Bernier questions what really happened that night, and the investigation suggests the fire may not have been an accident.

Following a reception at a fertility clinic, gynecologist Dr. Katia Tesson is found strangled in a laboratory. The RU soon discovers she was not killed there but moved after her death. As the investigation unfolds, the team must uncover who wanted her dead-and why they went to such lengths to stage the crime.

Patrick Bells, a former top 10 ATP player, is found dead on one of the courts at his tennis academy. A homophobic message found near his body points to a hate crime. But the RU investigation uncovers a secret affair and fierce rivalries among the academy's young players. Was his sexuality the motive for murder, or is there another truth to uncover?

Held in custody after three murders between Paris and Nice, Jeanne Lorieux becomes the prime suspect. As Alice Nevers investigates her links to the victims, the RU uncovers that she was set to marry Corentin Millet six years earlier, before his sudden disappearance. Despite the mounting evidence, the team struggles to believe she is guilty.