After a five-year hiatus, Rebecca is back on the job pursuing an elusive serial killer, all while grappling with disturbing blackouts and the breakup instigated by her husband.

As the team continues their investigation, Rebecca, convinced that Pierre Collange is guilty, ignores the chain of command to conduct her own.

Rebecca must play a double game after the police discover Laetitia's body; though Collange's alibi no longer holds up, Rebecca learns he's been released, and now it's Lucille who is in danger.

Rebecca systematically erases everything that could incriminate her in the disappearance of Laetitia Baumann; Pierre Collange proves more dangerous than ever for journalist Lucille Dolivet.

The serial killer has kidnapped a little girl, and it's a race against time to find her before it's too late; during her second hypnotherapy session, Rebecca discovers what really happened during her blackout with Julien.