Petrit works as a cleaner in the Ministry of Internal Affairs during the fascist occupation of Albania. There, he learns many secrets and helps the resistance with inside information.
Someone falsifies the lab data regarding the quality of imported goods. This results in the contract with a foreign company eing broken. The suspect is a specialist who handles the contracts. With these acts, saboteurs are trying to spread doubt and insecurity.
The events of the film happen in a huge industrial complex. A huge explosion interrupts an experiment. Engineer Genci, who was responsible for this experiment, discovers that the explosion was not an accident, but an act of sabotage.