Nora, a Martiniquan teenager, moves with her mother and younger sister to her grandfather Henri's to take care of him after a recent stroke. This causes traumatic childhood memories to surface for Nora embodied in the fear of an attack by an evil spirit, the Dorlis.

On the Atlantic coast, bales of pure cocaine were found at low tide several days ago. That morning, the body of Lucas Lagne, captain and son of a family that owned a shipyard in the region, was found. Sarah, a gendarmerie captain, is in charge of the investigation and will have to team up with Ben, from the narcotics squad, who has just been called in as backup by the prosecutor. The surprise of meeting face to face is great. 19 years ago, they lived in the same city, where Sarah fled when she was pregnant...

Juliette is attending the baptism of Lucas, the son of her best friend Claire. But the young mother, weakened by her childbirth, shows disturbing signs of depression.