Mary Louise Ballantyne, a two-year-old American Indian/Alaska Native girl with brown hair and brown eyes, was last seen on July 15, 1986, near Fairbanks, Alaska. She was described as about three feet tall and weighing roughly 20 pounds. Mary was traveling by boat with another person, Christopher Winer, on a trip through Stevens Village to Beaver when she disappeared; both Mary and Winer were reported missing after that journey.

The Alaska State Troopers handled the investigation. Details about the boat trip and what happened during it remain unclear, and the case has not produced significant new leads over the years. The circumstances leave many unanswered questions about how a toddler vanished while in the company of an adult in remote Alaskan terrain.

If anyone knew Mary, Christopher Winer, or has information about travel along the Stevens Village to Beaver route in July 1986, please share what is known.