On December 23, 1974, Mary Rachel Trlica (17), Lisa Renee Wilson (14), and Julie Ann Moseley (9) went Christmas shopping at the Seminary South Shopping Center in Fort Worth, Texas—and vanished. The only clue was a mysterious letter supposedly written by one of the girls, but its authenticity is heavily debated. Multiple leads over the decades haven’t produced any solid answers, and the case remains a baffling disappearance.