Storm Over Tibet (1952)

During World War II, David Simms pilots supplies between India and China over the Himalaya Mountains. One day he's forced to miss a flight and is replaced by his friend, Bill March. March's plane is lost en route and Simms feels guilty. Back in America he meets March's widow, Elaine. They marry and then both travel to Tibet to learn more about March's fate and about a mysterious Tibetan mask which has come into their possession.