Tonio makes a disturbing discovery at the shore. Another harrowing night with Emma pushes Camille to her limit. Marianne turns up the heat.

Emma's grieving is cut short by an urgent request, and a grisly scene at the Daugeron home leads Inspector Ronan into a world of demonic secrets.

Fifteen years earlier, in a bid to drive away Emma's nightmares, the friends gather at their old school for a ritual that will change their lives.