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The continuation of Franz Neumann's adventures takes place in 1941, just before the German attack on the USSR. A third player has joined the fight between the intelligence agencies - the Soviets. Half a year has passed since the thwarted attempt to damage the battleship "Bismarck". The flagship of the Reich is still in Gotenhafen (Gdynia), waiting to sail on its first combat cruise. In connection with this, the command of the Royal Navy does everything to establish this route in order to be able to set a trap. Franz, who is serving in the command of the Kriegsmarine, must fight to maintain his credibility in the eyes of the Germans.

In occupied Gdynia, Lieutenant Franz Neumann is drawn into another dangerous espionage game. Engineer Redliński, pursued by the Gestapo, unexpectedly finds Franz, seeking salvation from him. Meanwhile, Bergman recruits the brutal criminal Wulf to track down a traitor in the Kriegsmarine. Franz approaches Bergman's mysterious adjutant, Jorg, to gain information about Bismarck's operational plans.

After the explosion in Greta's apartment, the police start an investigation, and the SS starts to take an interest in her fate. Franz, suspecting treason, looks for the culprits and learns that the caretaker of the tenement house may have been involved in the attack. At the same time, he discovers that the daughter of a Polish engineer is alive and promises to help find her.

Franz, investigating the murder of a janitor, discovers that the killer fired a Russian rifle, suggesting the involvement of a Soviet spy. His investigation leads him to Redliński, who reveals that his daughter Hedwig may know the location of the scientific documentation.

Franz plans to rescue Jadzia, Redliński's daughter. In order to gain Bergman's trust, he sets a trap for Redliński, giving a false meeting place. He uses Eva, asking her to go on a cruise with Jadzia, during which he plans her escape. However, Eva changes the route, and Jadzia disappears.

Franz rescues Jadzia from Eva's hands and hides her with Redliński. Wulf follows them, trying to find secret documents. A group of spies goes to Pszczółki, where Jadzia's mother hid a suitcase with plans. The Germans organize an ambush, but Franz and Johann save Redliński and the girl.

Franz saves Eva from an assassination attempt, but discovers that there is a traitor in their organization. Eva and the Redlińskis are to be smuggled to Sweden, but the Russians and Germans try to stop them. Franz's plan misleads the enemy - instead of by train, the escape takes place by car on back roads.

Franz finds Greta in a Berlin cabaret and helps her escape from Engel. She later confesses that she once betrayed him by trying to sell information about Johann, who was collaborating with the Soviets. In Gotenhafen, the SS begins investigating, and Eva provides Franz with an alibi. Franz and Eva set a trap for Johann, giving him false information about the smuggling of documents.

Bismarck's sabotage is called into question when it is revealed that Johann has betrayed him. Eva fights to organize a banquet on the battleship that will enable the action to be carried out. Bergman hinders her plans, but thanks to Stromberg's influence, the banquet goes ahead. Franz organizes a new sabotage plan, involving Staszek, but after he is shot, Tadek takes over the task.

Lieutenant Franz Neumann discovers that Eva is missing. Stromberg was kidnapped by a fanatical Nazi Wulf, who wants to extract key information from her. Franz blackmails his superior, Bergman, to find her.