Hamster Holmes and Dr. Watt are called upon to investigate at the home of their friend, an inventor who thinks someone is trying to steal his ideas! At first, it seems like an open-and-shut case, until they find a new clue: a trail of freshly made footprints that ends suddenly. What kind of animal makes tracks like that? Hamster Holmes and Dr. Watt are on the case, but will they discover the culprit before the inventions are lost forever?