When the services of famed detective Sherlock Holmes are engaged to ensure the safety of Baskerville heir Sir Henry - recently arrived from America - Dr Watson is surprised to find his friend dismissive of the matter. In fact, Watson is dispatched alone to accompany Sir Henry to Baskerville Hall in Devon while Holmes deals with another case. Yet Watson finds the wild moors are a far cry from the orderly streets of London, and in the cold night a savage and bestial howl may be heard . . .