In April 2010, Cathy Terkanian received a letter that would change her life forever. The letter was written by a social worker, who explained that the daughter Terkanian had given up for adoption 35 years earlier had disappeared from her adoptive home in 1989. Driven by the need for answers, Terkanian enlisted the help of an amateur detective and local authorities, and began a 10-year quest to discover what had happened to her child.