As the priest makes a desperate bid to banish Marianne, Emma finds herself torn between two worlds, and Aurore searches for a way to save her friend.
Fleeing to different parts of the island, the friends encounter terrifying sights and ghostly messengers. One by one, they turn on Emma.
Inspector Ronan connects the dots between Emma's books and more real-world tragedies. He, Emma and Séby hatch a plan to destroy Marianne.
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.
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.
Tonio makes a disturbing discovery at the shore. Another harrowing night with Emma pushes Camille to her limit. Marianne turns up the heat.