On the eve of World War II four Parisians cope with the impending invasion of their city by German forces. While the French government braces for impact, the intersected lives of a young writer, a vain movie star, a French politician and a young scientist are examined as they attempt to deal with war and evade German spies.

The Willards from Terre Haute, Indiana travels abroad for the once-in-a-lifetime vacation in Paris, France. Harry Willard believes that the greatest problem will be avoiding tap water, but bringing his three children will prove to be more troublesome

A young, Scottish RAF gunner is debriefed by French officials about his escape from Nazi-occupied territory. They are particularly interested in one person who may or may not have been a German agent.