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.

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.