The Hound of the Baskervilles is looking for Harry Hotspur, but he's not looking for a vampire. He's looking for the holy See's Hound, who's been looking for him. The Hound tells Harry Hotspur that he smells the blood of a great man. Harry Hotspur says that the holy sees regard those who have blood like this as dangerous people, because they can cause a lot of trouble.