Sins of the Fathers by J.A. Jance

Retired police detective J.P. Beaumont is now a licensed private investigator. An old acquaintance named Alan Dale visits Beau with his granddaughter, Athena, and asks for his help in locating his daughter, Naomi, so he can ask her to sign over her parental rights to Athena because Naomi is homeless and is a drug addict. Beau misses working on cases and readily agrees. Beau is startled, though, when he sees a picture of Naomi, who looks very much like his daughter, Kelly, and realizes that Naomi is probably his daughter from a one night stand he had with Naomi's mother years ago. With all the connections that Beau has built up on the streets and in law enforcement, finding Naomi is an easy task—but unraveling the personal relationships of all involved, and even a few possible murders, is more complex. Sins of the Fathers is the latest book in the long-running J.P. Beaumont series. It will be published later this month.