Véronique Legat is removed, held captive, stripped, then released. Six other women looking like her have disappeared over the last 5 years. Martin and Jeannette begin their investigation with the husband of the first missing woman. Quickly, they are convinced that these women are dead. But why was Véronique spared?

"Save my children". These are the last words of a woman found lifeless in a pool of blood. For Martin, this is the beginning of a race against the clock. He will have to find two lost children in the city with a killer on their heels...

Martin wakes up naked, in the middle of the night, in an apartment he doesn't know and next to a woman he doesn't know either. Two days later, the body of a woman is found in the same bed and the weapon used was stolen from Martin's place...

In Paris, 7 people are murdered in a bus, including Martin's girlfriend. Off the case, Martin wants answers and his investigations lead him to believe the killer will kill again. 17-year-old Aurélien is an unassuming high-school student but a terrible secret links him to the massacre.