The Hound of the Baskervilles

Sir Charles Baskerville, a baronet, is found lying dead among yew trees in the grounds of his country house, Baskerville Hall. The cause of death is ascribed to a heart attack. Fearing for the safety of Sir Charles's nephew and only known heir, Henry Baskerville—who was coming to London from Canada to claim his inheritance—Dr James Mortimer travels from Devon to London, and appeals for help to Sherlock Holmes.