Mostaganem, 2019. In a few weeks, five teenage girls are found dead on the beach. The bodies all bear the same marks of violence. How to explain these serial murders? Mobilizing her informers and a cop friend, Houria, a seasoned journalist, leads the investigation. And despite the pressure to give up, the young woman is pugnacious. But the decision to continue her investigation at all costs will not be without consequences.