When Jake and Candy get to go and stay on their dad's new canal boat, they know the previous owner, Benjamin Fisher, has disappeared. No one knows where he's gone - or do they? As Jake and Candy begin to find out more about Benjamin - and the people he knew - they start to think there might be something more to his disappearance than meets the eye. Stop! Before you open the last chapter and reveal all, there's a challenge to face. Can you solve the mystery yourself? Or will you have to to break the seal.