If you've watched the show Grimm, this is exactly that! Its like they took the show and made a few minor changes. Instead of Detective Nick Burkhardt, you have Detective Sherlock Holmes. Burkhardt is a Grimm and can see people who are really monsters. Holmes is called something a bit different but has the same ability. Burkhardt is given a book that has been passed down through generations with information on these different monsters. Holmes comes across a similar book. Both Holmes and Burkhardt didn't realize they had this ability until adulthood. There really were no differences that made this story original. The only reason I listened to the whole book was because of the great narration. Alex Eller did an excellent job with each of the characters and all of the different voices and accents. I'd really love to hear more of his work.