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.

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.