The Gift Horse's Mouth by Robert Campbell (Jimmy Flannery #7)

Chicago precinct captain Jimmy Flannery is back—wisecracking, street-smart, and knee-deep in trouble.
When a routine favor turns into a tangled case of corruption and crime, Jimmy must navigate political backchannels and neighborhood secrets to uncover the truth. Fast-paced, funny, and full of gritty charm, this edition delivers classic detective storytelling with a Chicago twist.

Paperback, 1991

Goodreads: 3.58