Agathe, a young modern woman, arrives at her estranged mother's country house for a weekend stay, only to discover that her mother's new lover is a dangerous predator. The weekend program includes every activity a good aristocrat is expected to master: séances, music, horse riding, and poisoning.

Massacre

Four close friends cram into a car in the middle of the night and drive deep into the forest. They arrive at the spot where their lost friend Annie died, under the same tree. Camille, Flora, Lucie and Marion hold a ritual to ensure that Annie's spirit appears to them.