Cheerful spy comedy which matched up theatre stars Ralph Richardson and Laurence Olivier. But this isn't an acting masterclass. It's fast talking hijinks with Ralph as the ebullient secret service officer and Larry as the waspish, moody test pilot who snap laconic witticisms at each other in cut glass accents.
These government agents are so posh, Valerie Hobson is able to pass as a tea lady. The lower orders are mostly represented by a superb comedy butler. It is very funny, in a British screwball style. The plot is perfunctory, with mysterious spies stealing hi-tech planes, and the three stars out to track them down, climaxing with a punch up at sea.
The crisp wisecracks and Richardson's comic aplomb are the main attractions. Apparently his undercover fixer from the ministry in a bowler hat was the model for Stead in The Avengers. Olivier is disengaged, but Hobson brings a lot of elegant fizz as a proto-Sloane Ranger/reporter who pugnaciously spars with Larry before deciding to marry him.
This is one of the pre-WWII thrillers that hint at the coming hostilities, but don't yet name the enemy. Though the baddies have pretty thick German accents. Still, with hostilities are only weeks away, it doesn't take itself at all seriously. This is end-of-the-pier frivolity. At least the British sense of humour was in good shape and ready to go.