The 'Flying Fenway's' are in trouble. Frank and Lenny Fenway are ex-army flyers, who settled down in India after the war and opened up an airline. One of them, Lenny, disappeared in Tibet two weeks ago, with the company's only plane. He was carrying a Chinese passenger at the time, an agent, who has turned up half-dead, but who hasn't been able to tell them anything about the whereabouts of Lenny. The commissioner wants Steve to head to Tibet to find Lenny and get him out of there before he falls into the wrong hands...