Derrière les murs (2011) aka Behind the Walls

Centre of France, 1922. Suzanne, a young novelist lacking inspiration decides to isolate herself in the countryside to write her new book. As Suzanne discovers a sealed-up room in the basement of her house, she starts writing oddly easily. Visions and nightmares soon strike her while the villagers grow worried as several little girls mysteriously disappear...

Directors: Julien Lacombe, Pascal Sid
Writers: Julien Lacombe, Pascal Sid
Stars: Laetitia Casta, Thierry Neuvic and Jacques Bonnaffé