A lonely young woman, Lisa, moves into an apartment opposite an empty house. Soon afterwards, police discover the body of a man which has been sitting in an armchair inside the empty house for 30 years. Although Lisa does not know the dead man, he left her the house in his will. She moves in. At night she hears anguished cries from behind the walls. Investigating further, she becomes trapped in an eerie realm of hallways, rooms, forests and monsters. She meets a young man, Julien, who has been wandering this realm for years, and together they attempt to escape.