People in the small college town of King's Creek had always said the grand old Southern manor on Walnut Hill was haunted. Tomboy Peggy Patrick and her family move into the house and soon find out that not only is the ghost real, but it's their Great-Aunt Matilda! With their friends and a flop-eared dog as conspirators, Peggy and her brother set out to clear the name of Matilda's long-dead fiance, Calvin, wrongly accused of suicide. The location of a lost invention, the secret of the missing diary, and the truth behind Calvin's death are just some of the many mysteries they face.