Sherlock Bones, the world's greatest dog detective, and his trusty sidekick Dr Jane Catson are back for another crime-solving adventure. Bones and Catson are on a train bound for Paris when another passenger, a famous magician, vanishes in the middle of the night. Catson is convinced of foul play ... but none of the other passengers seem to know anything about the magician. Was he on the train at all? And how is his disappearance connected with a fiendish plot to steal the world's most famous painting, the Mona Lemur? Bones and Catson are up against it to reach Paris and solve the mystery before it's too late.