Elementary my dear Watson.. er.. Alexander. Arthur Conan Doyle's priceless manuscript for The Hound of the Baskervilles is missing! Was it burned as the ashes in the fireplace might indicate? Was it stolen and the half burned page merely a ruse to send our sleuths off the track? And what are the petals from a rare rose doing in Mr. Doyle's study when there are no flowers in the room? The mice help their cousin Sherlock and his friend Amy, with the reluctant assistance of Sherlock' rat nemesis, Mori Rati, discover that the manuscript has been stolen by the strange Mr. Smith. A frustrated author, he has stolen the story and is about to sell it as his own. The mice trick Smith and Doyle into meeting at Big Ben in the London fog and successfully return The Hound of the Baskervilles to its rightful owner.