In autumn 1941, Reich Protector Reinhard Heydrich’s brutal rule in occupied Bohemia and Moravia fuels Czech resistance. In spring 1942, the government-in-exile sends trained paratroopers led by Lt. Král on a mission to assassinate him. Masters Strnad and Vyskočil ambush Heydrich’s open Mercedes in Prague’s Libeň district, mortally wounding him despite a jammed submachine gun. Their success triggers harsh Nazi reprisals, mass executions, and an intense manhunt for the operatives.

This feature film based on the events of 1938 is a chronicle of the futile efforts of the Czechoslovak president Edvard Benes (Jirí Pleskot), politicians and ordinary citizens, to save the independence and the territorial integrity of the state from the advance of Hitler's Germany. On the 29th of March 1938 the leader of the Sudeten Germans Henlein (Werner Ehrlicher) has a meeting with Hitler (Gunnar Möller). Hitler orders him to intensify pressure on the Czechoslovak government. On the 24th of April in Carlsbad, the Sudetendeutsche Partei (Sudeten German Party) decides upon eight demands that are unacceptable to the Czechoslovak President, since they would ultimately lead to the break-up of the Republic. Benes still shows a certain willingness to negotiate, and Henlein resents this. The Germans are determined to make further negotiations impossible through incidents and violence.

The East German scientist Professor Gerlach has made a significant discovery with his research into how a new, even stronger pesticide can be protected against ineffectiveness through hydrolysis. This fact has not gone unnoticed by other interested nations. At the International Congress of Chemists in Geneva, a power struggle broke out between agents of the BND and the CIA over a preparation that had been smuggled into Switzerland without the knowledge of Dr. Werner, Gerlach's GDR representative and assistant, and which the enemies hoped would shed light on the composition of the invention.

In November of 1939, the British consulate in Norway receives documents saying that the Nazis are conducting secret rocket research in Peenemünde. But the British doubt the authenticity of the so called "Oslo report". Thus, the Germans continue their experiments unimpeded. At the same time, resistance groups from France, England, Poland, and Germany try to find and to sabotage the secret Nazi research base. When the first "V 2" rocket is successfully launched, the Allied commanders finally become interested in the "Oslo report".