I just finished a book called "The Hound of the Baskervilles." It's really good and I recommend it. Here's a summary...

Watson and Sherlock Holmes have stumbled on their greatest case yet. There has been a killing on the moor. The late Charles Baskervilles evidently has died of fright upon seeing the Dreaded Hound of the Baskervilles. Is the hound real? Who is the lone man living upon the moor? Who has been sneaking around Baskervilles Hall at night? Find out in "The Hound of the Baskervilles."