One spring evening in 1987, a college student got into a green car in Plymouth, New Hampshire and vanished.

His friends believed he was coming back. His family knew he would have called if he’d left on his own. But he was gone, and the man believed to be with him on the night he disappeared had a long history of run-ins with the law.

For more than 30 years, Pam Williams believed she knew how her brother died. She was told it was a medical event.

Some cases appear straightforward at first glance. A late-night crash on a quiet road, a damaged car, and a victim who doesn’t survive.

It started like so many Saturday nights at Mountain Park – music, crowded dance floors, and teenagers trying to stretch the night a little longer before heading home.

Regina Brown disappeared under troubling circumstances in April of 1987.

On a Saturday night in late June of 1986, a 20-year-old college student went out with friends in a familiar place, celebrating her softball team’s big win.

In the fall of 1976, a woman vanished from her home in rural Vermont sometime between a cup of morning coffee and the end of an ordinary workday.

Fifty years after James Cassidy’s death, there is still no simple explanation for his brutal murder.

In April of 1976, an anonymous call to a sheriff’s department in Maine alerted investigators to something almost impossible to imagine: a burning station wagon hidden off a remote road, and what looked like a body inside.

On a fall morning in 1988, police in Nashua, New Hampshire walked into an apartment and found two women murdered in their bed.

On a rainy night in late May 1989, a fire was spotted in a Westport, Connecticut parking lot.

On an August evening in 1982, children playing in Boston’s Franklin Park stumbled onto a scene that would quietly become one of the city’s most troubling unsolved cases.