The Thing Behind the Door tells the story of a young woman haunted by the death of her husband who was killed in a trench during World War I. Unable to accept the tragic loss, the young woman turns to black magic in the hopes of bringing her lover back. He comes back to haunt her in her dreams and asks to find an antic spell-book that holds the formula to bring him back to life. Summoning magic from the druids, combining the forces of nature with her own blood, Adèle is obsessed by the potential return of her beloved husband.

She ignores, as she performs the supernatural ceremony, that she becomes The Chosen One of a very ancient lineage of vegetal incubi, craving to perpetuate their race. What she resuscitates is a terrifying, unstoppable, and indestructible creature. A thing lurking behind the door, willing only to give Adèle the child that she was promised before the war.

Directed by Fabrice Blin, The Thing Behind the Door was co-written by Blin and Jean-Marc Toussaint. Blin also produced The Thing Behind the Door with Fabrice Lambot for Phase 4 Productions. The cast includes Séverine Ferrer, David Doukhan, Quentin Surtel, Yves Lecat and Fabien Jegoudez.