One night, Watson sees a light in the moor. He and Sir Henry go out to investigate, but a strange man rushes by in the shadows, then a distant hound howls, upsetting Sir Henry so much that he suffers a heart condition. Watson spots a man silhouetted on a hill in the distance, while he helps Sir Henry back to Baskerville Hall. Watson finds the silhouetted figure to be Holmes, who has concealed his own arrival to investigate more freely. After his death, Holmes and Watson find the corpse of the convict Selden, mutilated in a ritual, while wearing clothes belonging to Sir Henry, and the legendary curved dagger used by Sir Hugo. This clue exposes the Barrymores, who confess to have helped the escapee, who was their relative, by supplying food and other provisions each time he signalled with a light from his hideout. However, Holmes has evidence that neither the Barrymores nor Selden are connected to the death of Sir Charles, so he keeps on searching for clues to confirm the existence of the mysterious hound and the identity of its masters.