Blood Ties (Lydia Chin & Bill Smith #8) by S. J. Rozan

You can never escape your past . . .

Private detective Bill Smith receives a chilling late night telephone call from the NYPD. They're holding a suspected runaway--Bill's fifteen-year-old nephew, Gary. But before Bill can find out what's going on, Gary runs again, disappearing into the dark and unfamiliar streets...

Bill and his partner, Lydia, follow the troubled teen's trail back to his estranged family in a small town in New Jersey. They also discover the aftermath of a party where a young girl was found raped and killed. And that Gary was one of the last people to see her alive. . .