Aggie Morton lives in a small seaside town. Adventurous and imaginative but deeply shy, she hasn't had much to do since the death of her beloved father . . . until the fateful day when she crosses paths with twelve-year-old Belgian immigrant Hector Perot and discovers a dead body on the floor of the Mermaid Dance Room! As the number of suspects grows and the murder threatens to tear the town apart, Aggie and her new friend will need every tool to solve the case before Aggie's beloved dance instructor is charged with a crime Aggie is sure she didn't commit!