Inside co-directors Julien Maury and Alexandre Bustillo follow up their bloody and intense feature debut with this brooding, phantasmagorical horror film concerning three youths whose greed leads them into an inescapable nightmare. Young caregiver Lucie (Chloé Colloud) is still recovering from her mother's recent suicide when she joins her new boss Mrs. Wilson (Catherine Jacob) in making home visits to their elderly patients. Their last stop of the day is at a dark, labyrinthine mansion owned by Madame Jessel (Marie Claude-Pietragalla), a comatose, former ballet instructor with a stern reputation. After learning that Madame Jessel is rumored to have a priceless treasure hidden somewhere deep within the sprawling estate, Lucie is convinced by her boyfriend William (Félix Moati) and their waiter pal Ben (Jérémy Kapone) to stage a daring break-in on Halloween night, and steal the valuables under the shroud of darkness. But the deeper the trio journeys into the mansion the more they learn about Madame Jessel's malevolent past, including the bizarre death of her deaf daughter. By the time Lucy, William, and Ben have discovered Madame Jessel's darkest secret it's already too late, and they find themselves hopelessly caught in a twisted maze of unspeakable terror and supernatural torment.
by Jason Buchanan synopsis