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.

Fleeing to different parts of the island, the friends encounter terrifying sights and ghostly messengers. One by one, they turn on Emma.