Millie is a young woman looking for a job. She becomes a housemaid for a rich family: the Winchesters. Their house is beautiful, big, and perfect from the outside.

But inside, things are strange. Nina, the wife, is unpredictable—sometimes kind, sometimes angry. Her husband, Andrew, seems cold but charming. Millie quickly realizes that the job is not what it seems. She finds a locked door in the attic where she is not allowed to go.

As days pass, secrets are revealed. Millie discovers the truth about the family and must make dangerous decisions to survive.