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.

Inspector Ronan connects the dots between Emma's books and more real-world tragedies. He, Emma and Séby hatch a plan to destroy Marianne.