The exploits of Chief Police Inspector Chabrier, first before the invasion of France in May 1940 as he fights against spies preparing the coming the Germans, particularly Emmy de Welder, the alleged manager of the Rouen hospital. Later, Chabrier and his men go underground and resist the occupiers whatever the price to pay. When the Liberation comes Chabrier resumes his activities at the French National Police.

The Czar charges a man to deliver a message to the Grand Duke behind enemy lines. On his way he encounters a number of adventures.

A gang of poverty-ridden juvenile delinquents progress from petty theft to hard crime, but a kindly judge manages to set most of them on the right path after they are finally apprehended.

Lieutenant Orloff, a recently graduated Russian officier, is making his way across the snow-covered steppes to the garrison where he is to be stationed. He comes across a man who has lost his way in the blizzard and takes him to the safety of an inn. Arriving at the garrison, Orloff meets and falls immediately in love with Macha, the daughter of his commander. The town is suddenly attacked by a hoard of bandits who claims to be the true Tsar of Russia.