A classic production film made in line with the rules of socialist realism. An outright work of propaganda using patterns typical of action cinema, spy films and melodramas, as well as referencing ideas propagated by the party, such as the need for constant vigilance and social advancement of women.
The script was written by Adam Ważyk, a staunch advocate of communism in the post-war years who during the post-Stalinist thaw became one of its main critics, which he expressed in his famous "Poem for Adults".
Introduction of innovative work methods in the Bielawa steel mill near Warsaw meets with opposition from pre-war engineer Przewłocki. His opinion is challenged by Wanda Bugajówna, a foreman's daughter who became a technician thanks to the party's support. Mocked and rejected by conservative workers, she does everything she can to prove her worth. Meanwhile, an imperialist intelligence agent arrives in the area to destroy the steel mill. He murders Przewłocki, who refuses to work with him. Wanda is the only person who suspects that Przewłocki's death was more than a simple robbery gone wrong. She does not realise that by revealing her suspicions she will become the saboteur's next target.
