Consider other Victorian era books including Great Expectations by Charles Dickens, Jane Eyre by Charlotte Bronte, and Middlemarch by George Eliot.
Consider Sir Arthur Conan Doyle’s other Sherlock Holmes stories including A Sign of Four and The Final Problem.
It might be interesting to match The Hound of Baskervilles with Edgar Allen Poe’s works, including Fall of the House of Usher and “The Tell-Tale Heart.”