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.