In the early 1950s, in the People’s Republic of Poland, a spy codenamed “Shadow” suddenly disappears. “Shadow” had been providing key information of national interest to British intelligence. The Minister of Public Security assigns Major Witold Kosek to capture the spy. Much to the dissatisfaction of Colonel Bartman, head of counterintelligence unit, Kosek joins his department. Bartman orders one of his men to find compromising information about Kosek. Meanwhile, in another city, Doctor Helena Bielawska is accused of murdering a high ranking party official who was her patient. Her trial attracts Major Kosek’s keen interest. The story blends genres, including crime and spy thriller elements, with psychological drama and action, creating a vibrant cinematic spectacle filled with plot twists.