Dr. James Mortimer ask Sherlock Holmes to investigate the death of his friend, Sir Charles Baskerville. Sir Charles died at his Devonshire estate, Baskerville Hall, and Mortimer now fears for Sir Charles's nephew and sole heir, Sir Henry Baskerville. The death was attributed to a heart attack, but Mortimer is suspicious because Sir Charles died with an expression of horror on his face and Mortimer noticed "the footprints of a gigantic hound" nearby. The Hound of the Baskervilles, also translated as The Hound of the Baskervilles or the Mastiff of the Baskervilles is the third novel by Arthur Conan Doyle. The novel is set mainly on Dartmoor, Devon County West of England. Conan Doyle wrote this story shortly after returning from South Africa, where he had worked as a medical volunteer at The Langman Field Hospital in Bloemfontein The Hound of the Baskervilles is the third novel by Arthur Conan Doyle. He was assisted in the argument by a journalist of 30 years old the Daily Express called Bertram Fletcher Robinson (1870-1907). His ideas come from the legend of Richard Cabell, who was the inspiration for the legend of the Baskervilles. His tomb can be seen in a town called Buckfastleigh.