Police Commissioner Martin leads the investigation into tracing a serial killer loose in Paris, before another victim is killed. Meanwhile, in his own personal life Martin wants to be left alone in peace and quiet, but finds himself tangled up in the affairs of a group of women, each of whom hold a crucial piece of information to a ghastly truth…

When a private detective’s clients are methodically tortured and eliminated, Martin and his deputy, Jeannette, become convinced that the killer is female. But will the team manage to track down such a ruthless predator?

Over the past five years, six blonde, beautiful and highly qualified women have disappeared from the streets of France. When a seventh victim who matches the profile survives an abduction attempt, Martin and his team investigate the link.

With his daughter Isabelle in hospital and his relationship with Marion thrown into doubt, Martin finds himself engaged in a ruthless race against time to find a cold-blooded killer and two missing children.

Martin wakes in the middle of the night, lying beside a woman he doesn't know, in an apartment he doesn't recognize. Days later, a different woman is found dead in the same room, and the murder weapon is traced back to Martin's apartment.

A young girl is found dead under the ring road on the outskirts of town. As the homicide team hunt for their prime suspect, Akim Fediche, events take an even darker turn when it is revealed the victim had a younger sister, now also missing.