In Germany in 1922, a busy farmhouse suddenly goes quiet. After a few days, the locals realize they hadn't seen the occupants in awhile, so some neighbors investigate and find that the entire family had been brutally murdered. This case officially remains unsolved, and what makes it even more mysterious, is all of the bizarre events that happened to the family in the days leading up to their deaths.
Sources:
Hinterkaifeck: Germany's unsolved Farm Murders
https://www.amazon.com/Hinterkaifeck-...
Footsteps in the Attic
https://www.amazon.com/FOOTSTEPS-ATTI...
https://www.hinterkaifeck.ch/en/indic...
https://www.hinterkaifeck.net/wiki/in...
https://www.ranker.com/list/hinterkai...
https://www.grunge.com/340781/the-cre...
https://www.historicmysteries.com/hin...
https://www.alittlebithuman.com/cold-...