Charlotte Ann Erdman was 15 when she ran away from her home in Watertown, Wisconsin, on July 18, 1974. Family members believe a 41-year-old long-haul truck driver based in Illinois picked her up that day. About two weeks after she left, Charlotte sent a letter postmarked in Illinois saying she was safe, not involved in illegal activities, and would keep in touch. That letter was the last confirmed contact her family received.

Charlotte was not reported missing until May 29, 2019, creating a long gap between her disappearance and the official missing-person report. She is described as between 5 feet 7 inches and 5 feet 9 inches, 125 to 165 pounds, with brown hair and blue eyes. Law enforcement lists her as an endangered runaway and maintains DNA on file for future comparisons. Very little is known about her whereabouts after July 1974.

Did anyone in Illinois or along long-haul truck routes in 1974 ever encounter Charlotte or the driver who picked her up?