Some mysterious cold cases really manage to be very creepy indeed. 20-year-old Arnold Archambeau and his 19-year-old girlfriend, Ruby Bruguier, lived on the Yankton Sioux Indian Reservation in Lake Andes, South Dakota, and were having a bit of trouble since they had had a daughter named Erika Marie and were not quite ready to settle down. Like many young couples they wanted to live their lives and hang out with friends, and Saturday, December 11, 1992 was one of these days. That evening they went out partying with Ruby’s 17-year-old cousin, Tracy Dion, leaving their baby with Tracy’s father. It was supposed to be a fun night out, an all-night party spree, but dark clouds were looming and the trio was about to drive off into a perplexing unsolved mystery.