The rich landowner Sir Charles Baskerville is found dead in the park of his manor surrounded by the grim moor of Dartmoor, in the county of Devon. His death seems to have been caused by a heart attack, but the victim's best friend, Dr. Mortimer, is convinced that the strike was due to a supernatural creature, which haunts the moor in the shape of an enormous hound, with blazing eyes and jaws. In order to protect Baskerville's heir, Sir Henry, who's arriving to London.