Dana is a successful architect, and she moves into a nice old house along the beautiful coast with her family. There's a strange window in the attic that's not included in any blueprints, and it's driving Dana crazy. So, she decides to check it out and discovers that there's a secret room inside the house. Next, she learns that back in the day, families were quick to lock their kids in a room like this one to punish them. Children with deformities or just discipline issues were spending long days in what was called a "disappointments" room. Dana digs deeper and deeper until she comes across a blood-chilling secret that threatens to destroy everything and everybody she holds dear to heart.