It's Christmastime in London, and Sherlock Holmes takes on two cases. The angelic three-year-old child of a wealthy couple is the target of a vicious kidnapper, and a country aristocrat worries that his handsome, favourite son has mysteriously vanished from his London pied à terre. Holmes and Watson, aided by the colourful Heffie O'Malley, slip slide in the ice to ensure a merry Christmas is had by nearly everybody ...