... Colonel Shakhov, who works in the Main Artillery Directorate, learns that his daughter Alina covertly takes pictures of secret documents. Alina is a sick drug addict, and Shakhov thinks that when trying to get another portion of morphine, she started working for German intelligence. Despite his paternal feelings, Shakhov nevertheless reports this fact to counterintelligence, and General Zhukovsky decides to organize the seizure of a German spy during his meeting with Alina.
