A 1986 report tracing a mysterious 1924 attempt to climb Mount Everest. Britons George Mallory and Andrew Irvine were spotted less than 1000 feet from the summit, but were never seen alive again (Irvine's body has never been found; Mallory's was, in 1999). The hour speculates on whether they got to the top before they died. Interviewees include two members of the expedition, Noel Odell and John Noel; and Sir Edmund Hillary, who managed to get to the summit in 1953.