Lyndsay Faye's The Fatal Flame
The final book in Faye's series on Timothy Wilde--a young policeman in the early days of the New York Police, in the era of crazy political corruption, etc--centers on a local alderman who is being threatened with arson--by a LADY! An activist! Who wears PANTS! Obviously things are more complicated than that, especially once Timothy's brother gets involved. I really like these characters and this world, which is great, because they're a lot more compelling than the mystery here (maybe that's the point). I did have some unanswered questions (particularly about Mercy), but on the whole found this to be immensely readable. A-/B+.