Holmes and Watson are consulted about the arrival in England of Sir Henry Baskerville, the last of the Baskervilles, heir to the family estate on Dartmoor, following the death of Sir Henry's uncle. A local myth surrounds the Baskervilles that a vicious hound stalks the descendants of the family.
After Professor Moriarty is acquitted for murder, Holmes and Watson are visited by Ann Brandon, who tells the detectives that her brother Lloyd has received a strange note—a drawing of a man with an albatross hanging around his neck—identical to one received by her father just before his murder ten years previously.
