The Bat (Norwegian: Flaggermusmannen, "Bat Man") is a 1997 crime novel by Norwegian writer Jo Nesbø, the first in the Harry Hole series.
The first book in the Harry Role series. There are definitely better ones in the series, but it's also worth reading.
Unsympathetic main character, annoying reveal of murderer, flat ancillary characters, many paragraphs start in medias res - the book seemed messy to me, and I didn't enjoy it very much. Reading this on the heels of the first two Robert Galbraith books probably didn't help. I'm guessing it's going to take a long time before I bother reading Cockroaches, if ever.
