Ben and Marian Rolfe are desperate to escape a stifling summer in their tiny Brooklyn apartment, so when they get the chance to rent a mansion in upstate New York for the entire season for only $900, it's an offer that's too good to refuse. There's only one catch: behind a strange and intricately carved door in a distant wing of the house lives elderly Mrs. Allardyce, and the Rolfes will be responsible for preparing her meals.
But Mrs. Allardyce never seems to emerge from her room, and it soon becomes clear that something weird and terrifying is happening in the house. As the suspense builds towards a revelation of what really lies behind that locked door, the Rolfes will discover that their cheap vacation rental comes at a terrible cost . . .