The Sentence Is Death (by Anthony Horowitz)

The second book in Horowitz's metafictional series. He inserts himself as a character, a slightly egotistical Watson to a somewhat unpleasant Sherlock Holmes-type detective named Daniel Hawthorne.

I figured out who the murderer was about 60% of the way through (I put it as a Kindle note to prove that I had the right suspect) which isn't the most fun, but a lot of it was a surprise to me nonetheless and the execution was great! I love Horowitz's creativity and style, and pleasantly breezed through this one.