Kate and her mouse-accomplice Rupert are on board a train, but as soon as the train departs, mysterious things start happening. Fellow passenger Madame Maude seems the most likely culprit, until a surprising twist turns the whole investigation on its head. First in a witty two-colour chapter-book series about a bold young detective and a colourful cast of suspects, in a setting worthy of Agatha Christie. 8+ A delicious detective story set on a train!.