When newly developed planes being disappearing during testing with no trace a police Inspector and a test pilot begin to look into the possibility of espionage within the company.
Wartime dramas are very much of a standard affair feel good affairs where we beat the Germans. This is very much one of those the story is very flimsy and unlikely but it manages to have plenty to commend it. The story is carry by the comedy and the characters that make you overlook the sheer unlikely way in which the planes vanish. The story progresses to the inevitable shootout between the Brits and the Germans but on the way there's plenty to enjoy.
The film is mainly saved by a wonderful performance by Ralph Richardson as the inspector he is funny from the first scene and his character is wonderfully charming and forgetful. Olivier is also good, but it's not his best! The supporting cast of sassy women and foolish businessmen also add to the mix to make for an enjoyable romp.
Overall this isn't a classic but the comedy and a superb Richardson makes this better than the sum of it's parts.