City of the Sun by David Levien

Parents Paul and Carol Gabriel are devastated when their twelve-year-old son Jamie disappears while delivering papers one morning. Fourteen months later, he's still missing and they're frustrated by the police department's lack of interest. As their marriage falls apart, they hire former-cop-turned-private-investigator Frank Behr. Behr is just what they need—a tenacious detective having good connections, yet willing to break the law if necessary. Behr also knows how the Gabriels' feel, having lost his own son years ago. Behr and Paul work together in order to find out what happened to Jamie--is he dead or alive? City of the Sun is a great page turner. I could not put it down despite the disturbing subject matter. It reminded me of the novels of Harlan Coben.