Penny Mallory, a descendant of British mountaineer George Leigh Mallory, who died climbing Mount Everest, tells the story of New Zealand climber Edmund Hillary and Nepali guide Tenzing Norgay, who battled treacherous conditions to reach the summit.

Penny Mallory, a descendant of British mountaineer George Leigh Mallory, who died climbing Mount Everest, tells the story of New Zealand climber Edmund Hillary and Nepali guide Tenzing Norgay, who battled treacherous conditions to reach the summit.