In 1922, six people were brutally murdered on a remote farm in Germany. But what makes the Hinterkaifeck case so terrifying is not just the crime itself — it is everything that happened before and after.

There were strange footprints in the snow leading to the farm but none leading away. Family members heard unexplained noises in the attic. A key went missing. Then, after the murders, it appeared that someone stayed behind on the property. The animals were fed, smoke rose from the chimney, and food in the kitchen had been eaten.

More than a century later, the Hinterkaifeck murders remain one of the most chilling unsolved cases in history.