Someone knows the truth
New mysteries. New clues. New questions. Every week, a new case you can help solve.
Watch New Episodes on YouTubeThis Week's Episode
All Episodes →
Coming Soon
Mother & Daughter Murdered: Who Hunted Them?
They went for a hike and never came home. Strangers find Mary Cooper, 56, and her daughter, Susanna Stodden, 27, dead on Pinnacle Lake Trail in Washington State. They’ve been shot in the back of the head. Was this a random attack or were they targeted? The investigation can’t identify a single suspect and the case has grown cold, leaving their family grieving, with no answers. Can you help solve this mystery? If you have any information about the murders of Mary Cooper and Susanna Stodden or about anyone who frequented the Pinnacle Lake Trailhead in 2006, please contact the Snohomish County Sheriff’s Office at 425-388-3845 or click the Tips button.
Murder Oct 29
Coming Soon 
Unexplained Death Oct 29
Coming Soon 
Murder Oct 29
Coming Soon
Murder Oct 29
Coming Soon 
Listen to
every episode
The complete audio library – episodes from 2021 through today. Press play or take it with you.
Now Streaming
Unmasking The Tylenol Killer
After forty-six years, one of the greatest mysteries in American true crime may finally be solved. A man found dead in a Boise church. An unmarked grave. And a trail of clues pointing to one of the most notorious killers in our nation’s history.
The Library
Check out the back catalog, starting with the 1980s through 2024. Pick your era, or search the archive by case name.
Watch the original episodes of the series, hosted by Robert Stack. 233 episodes exploring the unexplained, the missing, and the cases that defined a generation of late-night television.
Have a Tip?
Even the smallest detail can crack a case. Submit a tip — the line is always open.
Submit a Tip →
Have a Story?
Have you experienced an unsolved mystery? Share it with our team — it may become a future episode.
Share Your Story →