Haunted Houses in Idaho

Laughing as you walk through the entrance, you and your friends are expecting this to be just another one of those family-friendly Haunted Houses. Maybe a hanging sheet on the wall and some eerie music playing out of a stereo system. When the door slams shut behind you, however, you quickly realize that you could hear a pin drop inside this living room. A flickering light bulb in the corner is barely illuminating the path forward. With no other option but forward, your group moves deeper into the home. Mere moments later you hear a shriek as one of your friends narrowly avoids stepping on a severed hand. The blood that coats the hand is bright red and is actively pooling around it. You all run back to the door, though it is clear that is will only open from the outside. You're about to find out not only whose hand that is, but also, perhaps more importantly, who cut it off...