Hannah and her best friend Amber discover a couple of strange hats in Hannah's closet. The hats were the type worn by flappers in the 1920's. The girls set out to discover the owner of the hats, and how they got in the closet. They enlist the aid of their elderly neighbor in the search of the secret behind the hats, and that secret leads to other startling and revealing surprises. During the course of their investigation a strange girl in a white dress frequently appears to Hannah in a vision. Who is this girl and what does she want? Amber thinks she is a ghost, but Hannah does not believe in ghosts. What could the connection be between the apparition and the hats? Is there one? In the process of uncovering the "Mystery of the Hats" they find: deception, murder, and a secret so shocking it changes one of their lives forever.