Broken Places (Chicago Mysteries, Bk. 1)

Cops can make mistakes, even when they’re not rookies. If anyone knows that it’s Cass Raines.
 
Cass took a bullet two years ago after an incompetent colleague screwed up a tense confrontation with an armed suspect. Deeply traumatized, Cass resigned from the Chicago PD, leaving one less female African-American on the force. Now she’s the head of a one-woman private investigation agency, taking on just enough work to pay the bills. But when the only father figure she’s ever known, Father Ray Heaton, asks her to look into a recent spate of vandalism at his church, she readily agrees to handle it.
 
Only hours later Cass is horrified to discover Father Ray’s murdered body in the church confessional, a dead gangbanger sprawled out nearby. She knew Pop, as she called him, had ticked off plenty of people, from slumlords to politicians, with his uncompromising defense of the downtrodden. But a late-night random theft doesn’t seem like much of a motive at a cash-strapped parish. The lead detective assigned to the case is all too eager to dismiss it as a burglary gone awry, just another statistic in a violent city. But Cass’s instincts tell her otherwise, and badge or no badge, she intends to see justice done . . .
 
 “An exciting new character-driven series.”
—Kirkus Reviews