What are all 'The Hound of the Baskervilles' clues?

The Hound of the Baskervilles is a great example of how a murder can be a mystery, as the only apparent answer is an impossible one. In Sir Arthur Conan Doyle's The Hound of the Baskervilles, the men in the Baskerville family are rumored to be haunted by an ancestral curse.