Zatoka szpiegów

Gdynia. Summer 1940. Franz Neumann is a 24-year-old Abwehr lieutenant. His stepfather is a high-ranking police officer in Gdańsk. He raised Franz with an iron hand, reserving more warm feelings for his younger brother Otto, who would soon set off on his first combat cruise on a destroyer. Franz is delegated to cooperate with the Krigsmarine, his direct superior is Commander Kessler. Franz does not shy away from alcohol and drugs, which are easy to find in the port city.

Franz visits the Swedish Mariner's House, where he learns that his father is a Pole named Kurkowski. Pastor Eriksson gives him a letter in which the father asks that his son be able to behave decently during the difficult time of war. Armed thieves attack Franza Street, but one of them, Staszek, turns out to be his former friend. Franz visits his mother and wants to find out more about his real father, but she avoids the conversation. But then she meets her son and admits that she once loved Kurkowski, but she thought he died at sea. Then she became involved with Lothar, who took care of her and her little son Franz. He does not reveal to his son the real motivation behind the relationship with the German.

At the Kriegsmarine headquarters, Kessler talks to engineer Holzer, who is responsible for the secret plan to build a research facility on the bay. They talk about using Polish specialists who know this reservoir well during the construction of the center. Franz comes to the command. During a conversation with Ilse, he manages to obtain a secret document regarding the resort being built on the bay. He is summoned by Kessler. He learns from him that his brother, Otto, died at sea during combat.

Kurkowski is taken to a German research center on the Baltic Sea. Engel tries to force him to cooperate voluntarily. Kurkowski refuses. At the Kriegsmarine headquarters, Franz meets Greta. Greta does not hide the fact that she would like to meet Franz during the Gauleiter Cup regatta that will take place the next day.

Franz visits his father and tells him that he works for the Allies. He asks him to help him sabotage the torpedo tests. In order to include Kurkowski in the secret homing torpedo program, he convinces Engel that the Polish engineer is a valued expert on this part of the bay. At the same time, Franz learns that the SS is looking for Lotta in connection with Kurt's death. He immediately warns her and asks her to escape from Gdynia.

Johann meets with Anna. He orders her to disappear from Gdańsk. The danger of Franz meeting her is too great. At the same time, Franz buys the book "Venus in Furs" from a street seller. On the street he meets Engel, who informs him that he is looking for a Polish prostitute involved in the death of Kessler's adjutant and the hunt for an enemy radio station operating in Gdańsk. Thanks to the book he bought, Franz deciphers a clue sent from London about how to damage a new torpedo tested by the Germans. When Ilse asks Franz about the cipher she found, Franz convinces her that it is part of his job as an Abwehr officer.

While Franz secretly experiences his father's death, the furious Kessler searches for the person responsible for the failure of the homing torpedo program. Roza is also suffering after Kurkowski's death, and Lothar informs her that he has been assigned to investigate Kurt's death. Anna meets with Franz and tells how the Polish intelligence faked her death to get him to cooperate. He also informs him that due to Kessler's increased vigilance, Franz is temporarily removed from espionage duties.

Right after discovering Franz's spy activities, Ilse dies in an accident - in fact, killed by Anna. The day after Ilse's death, Franz is summoned to Kessler. He accidentally learns that Kessler does not suspect Franz that Ilse's death had anything to do with him. Kessler knows that Franz was with his wife when Ilse died! Franz begins to understand that only Greta could provide him with an alibi. He begins to understand that Greta works for Kessler. Franz shares his discovery with Johann. He realizes the danger he is in.

Poles under the command of Johann and Anna are preparing to attack the battleship Bismarck. They want to place mines along its route. During the preparations, they are surprised by the Germans led by Kessler. Anna wants to kill them by blowing up mines. During the action, he notices that Franz is also among the Germans. She suspects him of betrayal. Johann soon explains to her that the mine operation was just a smokescreen intended to make Franz credible to the Germans and distract Kessler. At this time, divers led by Franz into the port planted explosives in the basin where Bismarck was moored. However, Anna still does not trust Franz and follows him.