Ben H Winters - The Last Policeman

Diligent detective investigates what he suspects isn't the straightforward suicide that it looks, in the looming shadow of a giant asteroid that will collide with Earth in mere months - in an existential pre-apocalyptic semi-hardboiled procedural. Quite good, but in a way that sent me to wikipedia to read the plot summaries of the following two books in the trilogy rather than sending off for the books themselves.