Case 137 is seemingly just another case for Stéphanie, an investigator at the IGPN, the police of the police. But an unexpected element will trouble Stéphanie and transform case 137 into something more than a simple number.
Three months after surviving a terrorist attack in a bistro, Mia is still traumatized and unable to recall the events of that night. In an effort to move forward, she investigates her memories and retraces her steps.