After discovering Mallory's body on Everest in 1999, modern climber Conrad Anker's life became intertwined with Mallory's story. Mallory's frozen body was found with his belongings intact; the only thing missing was a photograph of Ruth, which Mallory had promised to place on the summit. Haunted by Mallory's story, Anker returns to Everest with British climbing prodigy Leo Houlding to discover the truth about Mallory and to unravel the mysteries surrounding his disappearance.