The Bender family (Ma, Pa, Kate & John Jr.) built a one-room house in a remote region of Kansas in 1870.  The front of the house was a general store and inn and the back served as living quarters.  Being remote, the inn attracted travelers looking to get food, a night's rest and supplies for their trip.  Young Kate's beauty and charm helped convince many lone travelers to stay for dinner, especially if they looked like they had money.  She would have the guest sit at the "seat of honor" at the table which just happened to put his back right next to the sheet that divided the 2 rooms.  John Jr. would be behind the curtain and strike the guest squarely on the head with a sledgehammer, then slit his throat, killing him.  The body was then dragged backwards and thrown through a trap door in the floor, to  be buried later.  The Benders took everything of value from the guest, including livestock they were traveling with.  They were found out when someone came looking for a missing family member and started an investigation.  A neighbor noticed the inn was abandoned and notified the authorities.  Search volunteers tore the house apart and found the bloody cellar and freshly turned dirt.  They ultimately found 10 bodies, but 21 murders were attributed to the family, including an infant that was possibly buried alive.  The Benders suspected trouble and had cleared out already and were never seen (or caught) again.  BTW, there's plenty of evidence that the Benders were not a family, not related and not even named Bender.