Hattie has her summer with her friends all planned out until her mother informs her that she will be leaving for two weeks to visit Grandma Nettie. Begrudgingly, Hattie visits her grandma, only to have the unexpected happen when she sneaks up to the attic and places a magical hat upon her head. Hattie in the Attic is the charming story of how this curious girl's vacation becomes an unforgettable experience.