Ralph Richardson is the charmingly eccentric major Hammond of Scotland Yard, who is called in to investigage the mysterious disapearance of new British planes on their test flights. He joins forces with dashing, glamorous pilot Tony McVane (stunningly gorgeous Laurence Olivier)to investigate the matter. They are helped and hindered by Hammond's younger sister, spirited and inquisitive newspaper reporter Kay (Valerie Hobson). Eventually McVane takes a test flight himself, determined to get at the truth. All three of the main characters give wonderful performances, especially Ralph Richardson as Hammond, never without his umbrella (his character, according to Leslie Halliwell, was the inspiration for Steed in The Avengers), and the plot, though far-fetched is exciting and enjoyable enough to carry you along to the end. First-rate entertainment.