There was nothing about this book I didn't like. The main characters were great (even the nasty ones) and the minor characters were sometimes fascinating (I'm thinking of the autistic savant Aubrey Alsthom, who is basically a nineteenth-century internet). The settings are well drawn, the individual episodes are gripping (especially the opening chapter with its suicide and inquest) and the writing is wonderfully textured. The scene at the end in the slaughterhouse district is amazing. It kept me excited all the way through.
I've never been much of a fan of historical fiction, but I would definitely read more of James McCreet's books because I'd like to see what else he does with this group of characters. Unlike other crime books, there isn't just one detective, but a group of them who compete to solve the crime.