Enid Blyton's tale, 'The Mystery of Banshee Towers', takes the Five Find-Outers and Dog on an adventure that breaks the mold of their previous investigations. While on a school holiday, the children's parents encourage them to explore the countryside rather than unraveling mysteries. Intrigued by the haunted reputation of Banshee Manor, the children visit the stately home, known for its sea paintings. However, their innocent admiration leads them to uncover a sinister plot orchestrated by the manor's owner, an art forger, and a conspirator.