Mary Margaret Click, 21, left Madison, Wisconsin in the summer of 1978 intending to hitchhike to Banff, Alberta. The last contact from her family was a phone call placed on July 1, 1978 from Isle Royale, a remote island in Lake Superior, Michigan. She sometimes used the last name Podma and was described as a white female with brown hair, hazel eyes, and a chipped front tooth; she was believed to be wearing hiking shorts and good quality hiking boots.

That same day some of her personal belongings were found on a dirt road off Riverside Drive in Thunder Bay, Ontario. Witnesses in the Thunder Bay area reported seeing someone matching her description walking along Riverside Drive. On August 1, 1978 additional belongings were recovered in Raith, Ontario, about 92 kilometers northwest of Thunder Bay. Traveling from Isle Royale to those Ontario locations on July 1 would have required an unusual sequence of ferry, border crossing and long overland travel, a timeline that has never been reconciled.

The Madison, Wisconsin police department is listed as the investigating agency and the circumstances of her disappearance remain unclear. Did anyone in the Thunder Bay or Raith areas know Mary or see her that summer?