A fun spy thriller made right at the outbreak of WW2. It deserves plaudits for the excellent casting of Ralph Richardson as the quirky and flamboyant investigator character who seemingly inspired the look of John Steed, no less. The story, about experimental aircraft and sinister forces trying to steal them, is quite straightforward but you get added dashing Laurence Olivier and Valerie Hobson so it's all quite light and enjoyable. The all-action climax is very well handled, although I was annoyed that a plane sprayed with machine gun fire doesn't get a single bullet hole...