Stacy Ann Arras, 14, disappeared on July 17, 1981, during a horseback riding trip at Sunrise High Sierra Camp in Yosemite National Park. She had walked ahead to take photographs of a nearby lake with a 77-year-old man from the group; he stopped to rest and Stacy continued. A guide last saw her standing on a rock about 50 yards south of the trail before she went out of sight behind trees and never returned.

A massive search followed: roughly 150 searchers, the National Guard, six dog teams, divers and three helicopters spent nine days and over 8,000 man-hours covering a three- to five-square-mile area around Sunrise Lakes. The only item recovered was a camera lens cap near the trail. Terrain difficulties and dry conditions were noted as limiting the search dogs’ effectiveness.

Investigators and others have floated multiple theories — animal attack, runaway, foul play and simply becoming lost and dying in cold nighttime temperatures near 40 degrees Fahrenheit — but no definitive evidence has emerged. Does anyone who was at Sunrise High Sierra Camp that week or who knew Stacy remember details that could help explain what happened?