Bonnie Montgomery is the world's best detective. Not that anyone (other than Grampa Banks) has heard of her. But they might have heard of the great Montgomery Bonbon, the well-dressed gentleman detective who (apart from the hat and moustache) looks suspiciously like a 10-year-old girl. Their newest case: solving the mystery surrounding a highly suspicious death at the Hornville Museum. Together they'll interview some dodgy witnesses, scour the scene for clues and - above all - hope no one notices that Bonnie and Montgomery are never in the same room at the same time.