Based on the true story of Heather Robinson, who was abducted as a baby and raised by the family of a serial killer who was convicted of murdering her mother.Heather grew up in a loving family in Illinois. By the time she was a teen, she had long known that she had been adopted as an infant by her parents. But in 2000, the then-15-year-old’s world was shattered when she learned that the man she knew as her uncle, John Robinson (Guttenberg), was a serial killer accused of murdering multiple women in the Kansas City area, including her biological mother, Lisa Stasi. After her uncle’s arrest, Heather learns the shocking truth about her birth mother’s disappearance. Kramer portrays an investigator working on the case.