Diane Kramer (Emmanuelle Devos) is led by one obsession: to find the driver of the mocha-colored Mercedes which hit her son and devastated her life. With a few belongings, some money and a gun, she goes to Evian, where she has learned the driver lives. But sometimes the path of revenge is more tortuous than it seems. Diane will have to face another woman (Nathalie Baye), friendly and mysterious...

Laure and her squad desperately try to locate the missing teen.

A mistake by the investigation team yields a shocking outcome; Roban runs out of options.

Secrets and lies become too much for Tintin; Joséphine is in jeopardy if she sticks to her story.