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.

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.