Dr. Richard Mortimer recounts to Sherlock Holmes and Doctor Watson the legend of the ghost hound that killed the devilish Sir Hugo Baskerville for his murder of the daughter of a servant. He asks Holmes to investigate the death of his friend Sir Charles Baskerville, in Dartmoor, from heart failure, lying in the moor surrounding his estate, Baskerville Hall, with a look of horror on his face. Mortimer fears for the life of Sir Henry, who's just come from South Africa to take possession of his inheritance and of Baskerville Hall.