The year is 1948 and a counter-revolutionary gang is active in the Pirin region. A State Security officer managed to infiltrate the gang. He becomes "one of their own", but isn't in a rush to complete his task.
During World War II, a plane transfers Bulgarian antifascists from the USSR to Bulgaria. They jump with parachutes. The eighth paratrooper heads a guerilla group. In the group, there are doubts about the existence of a traitor. Initially, an innocent person is accused, but later the real traitor is caught and killed. Still, the most dangerous enemies of the guerillas are the colonel and the troops stationed in the nearby village. The battle between them and the guerillas is won by the latter who continue to fight for their cause.
A dentistry student, graduating with honor, does not get the desired job and has to start working as a MASTER OF ALL TRADES in a construction company. He has to paint walls, clean chimneys, and fix water conduits. He is not able to accomplish any of these tasks and gets into funny situations all the time. Moreover, he and his roommate, a good friend of his, quarrel over a girl. But this situation is a misunderstanding as well - the friends love different girls. A happy end is in sight.
A geologist engineer Yuliya disappears. Ablamov, an elderly engineer, organizes a rescue party to look after her in the mine galleries but they find nothing. Yuliya was last seen at a ceremony for award-wining miners. The newsreel crew was filming the event. Yuliya left in the middle of ceremony. Prodanov, a headstrong and quarrelsome engineer, had followed her. Suspicion falls on him. However, the film sequences shot at the ceremony reveal that Ablamov reacted suspiciously to Yuliya's exit. Detected as the murderer, Ablamov attempts to cross the border but is caught. Yuliya had discovered that the ore contained uranium. Ablamov had replaced the samples in order to prevent the development of the uranium ore deposit.
The main heroes are twin brothers. The first is responsible young fellow and excellent footballer. The second one is an undependable gambler. The police are after him. A pretty girl stands in between them. She has profoundly fallen for the footballer. By coincidence, the twins change places, which result in a formidable mess and funny situations. Ultimately, all the misunderstandings are settled and the couple re-joins.
