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.

Arrested for attempted murder, Rebecca gets Pierre Collange to confess to the crimes of 2015; buried trauma resurfaces as the tension mounts between Rebecca and Julien.

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.

Rebecca identifies Laetitia Baumann's murderer and to prove his guilt, conducts a covert operation that backfires; a final hypnotherapy session reveals the terrifying origin of Rebecca's blackouts.