Following a collision of two boats in the bay of Sete, many victims were found. Worried, Chloe goes into a search for her missing son. In the meantime, a woman is found stranded on the shore.

Chloe finds out that her son is in police custody. A woman, who was on one of the boats which later collided, was found on the beach. But who is she?

A woman stranded on the shore was in fact Chloe's sister Anna. As she is lying in a coma, Chloe is trying to find out what had happened to her estranged sister, whom she hasn't seen in 17 years. And why did she hide her identity from Maxime?

Chloe meets Martin, Anna's companion. He is in Sète, alone, trying to find a way to exonerate Anna. Chloe decides join him and they continue the investigation together.

Anna gains her consciousness, but with a loss of memory. She finds out that she is pregnant, but does not know who the father is. Chloe helps her regain her memory.

Anna gets arrested under the suspicion that she was to blame for the collision. However, she quickly gets released, after Laurence tells the detective that there was a bomb planted under the boat. Who could have planted it and why?