Fred MacMurray is an American pilot in London during the Blitz. He ducks into an air raid shelter and encounters Madeleine Carroll, whom he tries to court with duck calls and reminiscences of life in a cave ten thousand years earlier.
She is naturally bewildered, but since this is a Paramount movie, we know that eventually hands across the ocean will win. Unfortunately, the story involves a trip to Portugal, spies trying to steal a letter, and MacMurray's ex-wife. Miss Carroll spends most of the first half of the movie being confused and distraught, and the second half being amorous and distraught, trying to make sense in a world full of unexploded bombs, good-looking John Loder, advice from May Whitty, Edmund Gwenn and Billie Burke. The rest of the cast is up to this American-style nonsense, but not, alas, Miss Carroll.