The Setup Man by T.T. Monday
Baseball noir! Johnny Adcock is the Veronica Mars of the MLB, a relief pitcher who spends his off hours moonlighting as a PI, tailing cheating spouses and doing favors for his frenemies. Monday's characters and world-building were great; his writing was a little rough at times, but this was his first novel so I'm definitely interested to see his future efforts. If you like both baseball and mysteries, this is a great spring read.