Trixie Belden and the Marshland Mystery

When Trixie and Honey set out to gather herbs for their teacher, they stumble upon Martin's Marsh and its mysterious inhabitant. Their herb-gathering mission takes a turn when a young child prodigy staying nearby vanishes, sparking fears of a kidnapping. The search leads them back to the marsh, where Trixie must uncover the secrets of the land and its owner to help a troubled child and save a home from eviction.