On November 25, 2010, three brothers headed to their father’s house to spend Thanksgiving with him. The next morning, their mother reported them missing after they failed to return home. Their father had continued telling lie after lie about his sons’ whereabouts. The children have never been found and police were unsuccessful in proving their theory that the father killed his sons and disposed of their bodies.

Cindy Song: A 21-year-old apparently vanished, leaving detectives with nothing to go on but hunches and theories. The best lead in the case so far is that she was kidnapped by two career criminals who mistook her for a sex worker and murdered her. However, this theory has yet to be proven and her whereabouts remain a mystery to this day.

Marvin Clark: An Oregonian man mysteriously vanished while en route to visit his daughter over the Halloween weekend in 1926. An accidental discovery made decades later only proved to add another layer of mystery to what’s become one of the oldest unsolved missing person cases in the United States.

On April 17, 2016, a 30-year-old left her home with an unknown man, leaving her husband, boyfriend and four children behind. Friends and family weren’t concerned until she failed to show up to work. Her disappearance was reported nearly a week later. Eight years later, she remains missing and her case remains unsolved.