When the Bough Breaks -Jonathan Kellerman

Dr. Morton Handler practiced a strange brand of psychiatry. Among his specialties were fraud, extortion, and sexual manipulation. Handler paid for his sins when he was brutally murdered in his luxurious apartment. The police have no leads, but they do have one possible witness: seven-year-old Melody Quinn. It's psychologist Alex Delaware's job to try to unlock the terrible secret buried in Melody's memory. But as the sinister shadows in the girl's mind begin to take shape, Delaware discovers that the mystery touches a shocking incident in his own past. This connection is only the beginning, a single link in a forty-year-old conspiracy. And behind it lays an unspeakable evil that Delaware must expose before it claims another innocent victim: Melody Quinn. First in the series.