World War I aviator Carbot attempts to establish a commercial airline after the war, for the purpose of delivering the mail to the outermost regions of France.

While on holiday on the French Riviera, former soldier Robert Teller recounts his time in WWII-era France, where he meets and falls in love with a poor girl named Lise. However, they're unable to marry when Lise is accused of prostitution and Teller's commanding officer forbids the match. The couple's love is again tested when Teller learns the truth about his would-be wife's whereabouts.

A German intelligence officer investigates a prostitute's killing in Warsaw during World War II. He lands on three major Nazi generals as suspects, two of whom are also involved in a plot to kill Adolf Hitler.