The Hound of the Baskervilles

Dr James Mortimer asks Sherlock Holmes to investigate the death of hisfriend, Sir Charles Baskerville. Sir Charles was found dead on thegrounds of his Devonshire estate, Baskerville Hall, and Mortimer nowfears for Sir Charles's nephew and sole heir, Sir Henry Baskerville,who is the new master of Baskerville Hall. The death was attributed toa heart attack, but Mortimer is suspicious, because Sir Charles diedwith an expression of horror on his face, and Mortimer noticed "thefootprints of a gigantic hound" nearby.