This was a funny book to read and review. It continued on the same kind of style of the preceding books, and there was a lot to like about that. The plot line made sense and the mystery was pretty good too. The author's overall style is quite good.
But I did have some issues. Slight spoilerish themes ahead:
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Where the book really suffered was the main character. We observe the slow change to the dark side as he makes darker and more dubious decisions. In the context of his musings they are justified, but as the reader looking in? A simple step back and thinking about it shows his justifications are all on what MIGHT happen. Or in some cases keeping the status quo.
Now, maybe the author is a genius and this is deliberate, and a subsequent book is going to bring home to the Detective exactly how dark his decisions have become, and which side he's now batting for. But I suspect not. I suspect the author hasn't really thought through how flimsy the justifications he used were, or what the detective really did. We've all heard the arguments for the ends justifying the means, but the ends here were nowhere near certain.
Overall, I just couldn't shake the feeling the main character should be sent to prison. And that took a lot of gloss off the book.