This is also known as the “Concrete-encased high school girl murder case.” The Wikipedia article basically tells the real life story of a 17 year old Japanese girl who was abducted and held for over 40 days while being tortured. You will call your mom just to tell her you love her after reading this.
In 1922 a family of six was killed on their farm by someone with a pickaxe-like tool.
A few days prior to the crime, farmer Andreas Gruber told neighbours about discovering footprints in the snow leading from the edge of the forest to the farm, but none leading back. He also spoke about hearing footsteps in the attic and finding an unfamiliar newspaper on the farm. Furthermore, the house keys went missing several days before the murders, but none of this was reported to the police.
Six months earlier, the previous maid had left the farm, claiming that it was haunted; the new maid, Maria Baumgartner, arrived on the farm on 31 March, only a few hours before her death.
Exactly what happened on that Friday evening cannot be said for certain. It is believed that the older couple, as well as their daughter Viktoria and her daughter Cäzilia, were somehow all lured into the barn one by one, where they were killed. The perpetrator(s) then went into the house where they killed two-year-old Josef who was sleeping in his cot in his mother’s bedroom, as well as the maid, Maria Baumgartner, in her bed-chamber.