Stacey Ann Arras was 14 when she disappeared from Yosemite National Park on July 17, 1981. She was visiting the Sunrise High Sierra Camp with her father and a group of seven others after a day of horseback riding. Stacey set out alone to photograph a nearby lake; an elderly man from the group walked with her briefly but stopped and she continued alone behind a stand of trees and never returned.

An extensive search involving helicopters, search dogs, and more than 100 people turned up only a single lens cap from her camera near the treeline. No clothing, camera, or other personal items have been found, and examiners reported no signs of an animal attack or a witnessed abduction at the scene. Numerous theories have been suggested over the years, but none have produced concrete answers about what happened to Stacey.

If anyone was at Sunrise High Sierra Camp on July 17, 1981, or remembers seeing Stacey that afternoon, please come forward with what you know.