Philip McAlpine is blackmailed into a little mission for the London Secret Service. He's to get himself recruited into International Charter, the ""Hertz of the Flying Spy business"" used by all the powers as a matter of mutual convenience. Philip, a protective coward, is ruthless when it comes to saving his own skin so when asked to doublecross International by flying Nazi war criminal Detmann into English clutches, he fashions a cozy little blackmail scheme of his own. Ak-ak action. Bang on!