

In England, an eccentric police inspector, an earnest test pilot and a spunky female reporter team up to solve the mystery of a series of test aircraft which have disappeared without a trace while over the ocean on their maiden flights; unaware, as they are, that a spy ring has been shooting the planes down with a ray machine hidden aboard a salvage vessel which is on hand to haul the downed aircraft aboard, crews and all.
Acting
Ralph Richardson's umbrella-wielding inspector steals every scene.
Practical Effects
Charming miniature aircraft and gloriously fake ocean sets.

Director
Tim Whelan
Trivia, insights & behind the scenes
Released mere months before WWII began, its 'quaint spy threat' tone curdled into genuine anxiety almost immediately.
Olivier reportedly loathed this 'quota quickie' so much he tried to buy and destroy prints—making surviving copies accidentally precious.