Angel of Mercy

About to leave Chicago for a new job in Portland, Oregon, Briggs is suddenly swept up in the murder investigation of his homeless friend, Mattie Powell. Chicago homicide detectives gave the case low priority until they discovered Powell was a New York Times best-selling author. The victim's drug-addicted son and estranged husband, who is trying to claim her book royalties, are the prime suspects—until an anonymous call to a tip line identifies Briggs as a possible serial killer.