Correspondent Erin Moriarty and 48 HOURS take viewers inside law enforcement's 30-year game of cat and mouse with a convicted child serial killer to get him to reveal where he left the body of a girl he murdered.

Sarah Harris was a bright, young Maryland woman who dreamed of a career in medicine. On the morning of Jan. 26, 2022, she was found unresponsive on the floor of the home she shared with her boyfriend, Dr. James Ryan. Ryan told police it was an overdose, but Harris' family believed he was responsible.