"Dr. Jekyll and Mr. Holmes" by Loren D. Estleman

Yes, you read that title correctly.  This book puts Sherlock Holmes and Dr. Watson into the world of The Strange Case of Dr. Jekyll and Mr. Hyde  by Robert Louis Stevenson.  I picked this book up a couple of years ago when I was teaching my niece literature.  We read both The Hound of the Baskervilles and The Strange Case... that fall, and she said she wished someone would write a story where Holmes solved the case.  I said I bet someone had, and lo and behol...