The explosion of a 4300 tones Kauper furnace brings up an inquiry, conducted by Ștefan, a Romanian Communist Party activist. He is trying to get to the truth, even if he is pressured just to assign blame.

Major Smith, a British intelligence officer, receives an assignment to transport to England a professor of the University of Bucharest, a geologist who has discovered a deposit of uranium ore in Romania. However, the professor suddenly disappears. To find him, the British devise a complex operation. In turn, German intelligence decides to use the results of the British. But there is a third interested party - Romanian patriots. They are relentlessly following the actions of the two intelligence agencies, trying to protect the professor and his discovery. With their help, the Romanian police commissioner manages to arrest the whole gang of spies.

In August 1944, students at the military school for officers must defend the country's border from the Nazis during the Battle of Păuliș in Romania's northwestern border.

Engineer Bunea, a site manager, neglects his personal life in favor of his professional duties. But going through a crisis of conscience, he wants to give up the responsibilities of his job and tries to find a more peaceful job.

1978 film by Dinu Cocea