In 1987, Ron and Margie Pandos awake to find their daughter Jennifer missing from her bedroom. Decades later, Jennifer's older brother Stephen believes their parents are responsible for her disappearance and has the investigation re-opened.

With the police focus on Ron and Margie, investigators scrutinize Ron's past as a Vietnam veteran and his criminal record. Margie is offered immunity in exchange for testimony against Ron. After decades of estrangement, Stephen confronts his father. But when new information emerges, the investigation goes in an unexpected direction.

A trove of Jennifer's personal writings paints a picture of a struggling teenage girl. The re-appearance of lost evidence refocuses the investigation on an original person of interest. Stephen continues to believe his mother holds the key to the truth.

As the police investigation heats back up, Stephen learns about secret legal proceedings and a police subpoena regarding someone from Jennifer's past. New evidence takes an emotional toll on Stephen and his family.