It is while standing over the body of a disfigured young woman that Commander Matthieu Pérac learns he will henceforth have to team up with Chloé Saint-Laurent. Pérac is one of the best Judicial Police commanders in Paris—a hands-on cop who protects his men just as he does his family.

A young oncologist is found poisoned in his own department. Chloé's support will prove crucial in helping Matthieu solve a case that echoes the recent death of someone close to him.

The murder of a young lawyer, devastated by the dramatic consequences of his first trial, leads Matthieu and Chloé to the trail of a psychologist who practices hypnosis.