Lonely widow Joyce rents out a room in her house and becomes dangerously obsessed with one of her guests.

The young artist Wanda Leibovitz comes to Paris, hoping to forget unfortunate love. Soon after arrival directly at the station Wanda meets the mysterious old woman suggesting to rent at it the room (whom the old woman, allegedly, held ready for the now deceased sister). Wanda doesn't know yet that this room will change all her life shortly after it slightly opens a mysterious forbidden door.