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Just prior to World War I, the Kaiser sends Baron von Zeller to inform Emperor Franz Josef of Austria that he is ready to declare war on France. Sensing the impending crisis, the French War Office dispatches secret agent René de Bornay to investigate the situation, and upon his arrival, he cultivates the friendship of Franz Josef's mistress, the Countess Griselda von Arenburg. Austria's Archduke Franz Ferdinand, distressed with the countess' influence over the Emperor, resolves to get rid of her, but she learns of his plans and commissions her Serbian servant Danilo to murder him. Baron von Zeller, who loves the countess, covers up her part in the assassination and asks her to come to Berlin to serve the Kaiser as an agent. In Berlin, she again meets René, and although she has been assigned to expose him, the countess falls in love with the Frenchman and urges him to escape to France. Just as René leaves her apartment, von Zeller enters, and having learned that she hid René from the Germans, has her shot on the spot.

The command of one of the Soviet divisions becomes aware of the alleged enemy counterattack. Scouts sent to the enemy rear to clarify the data did not return. A new group of seven scouts called the Star is led by Lieutenant Travkin.

Wartime Prague... The last scenes of a cabaret operetta are being filmed at Barrandov film studio when word spreads that the main star, Karla Hlinová, has been arrested by the Gestapo. Fear, dismay and apprehension reign, but producer Stanislav Dragant knows what to do. He uses his connections and Karla is released the next day - filming can continue. However, the well-known actress cannot shake the terrible feeling that she is being watched and that more Nazi action will follow, even though Dragant and his friend, a German businessman Planetta, repeatedly assure her otherwise.

The unsuspecting Parisian postman Thibon accepts a transfer as army mailman in Indochina. In the hospital, after his mail van is blown up by a mine, he falls in love with his Indochinese nurse Vang.