Just as best-selling author Emma Larsimon announces she's done writing horror, an unnerving visit from an old friend draws her back to her hometown.

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

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

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.

While a quirky police inspector digs into her parents' case, Emma drags Camille back to Caro's home and reconnects with the rest of her old crew.

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.