Laure Berthaud's team investigates a nanny who’s been accused of murdering a young, single mother’s baby.

The police delve into the personal life of a businessman who burned to death in his own home, Clement struggles to conceal his friendship with a suspect in the Andrescu case, and Gilout's drug habit gets out of control. The mother of a murdered baby is accused of negligence.

A prominent ministerial adviser, who has links to prosecutor Pierre Clement's close friend Benoit Faye, joins the list of suspects for the ruthless killing of Elina Andrescu. Meanwhile, Captain Laure Berthaud comes up against lawyer Josephine Karlsson during an inquiry into a double murder.

The inquiry into Elina Andrescu's murder takes yet another disturbing turn when the body of her missing sister Sophia is found in a freezer. Prosecutor Pierre Clement must recognise that the involvement of his friend Benoit Faye goes deeper than he'd been prepared to believe. A distraught and vulnerable Ghisele Anloux is brought to trial in connection with the murder of her baby.

Pierre Clemente initiates divorce proceedings when estranged wife Marianne and her family business become implicated in a drug trafficking scandal, and lawyer Josephine Karlsson is called in to defend a man who is charged with brutal acts of torture.