After being wrongfully accused of painting an anti-German graffiti - which his daughter Jeanne was actually responsible for - Mayor Le Maréchal and his offspring are brought to the Kommandantur. There, they meet Oscar, the mayor's son and his sister's polar opposite, since he's a pro-German militiaman, which participates in fueling a long-lasting feud between the two siblings. The mayor seizes this opportunity to ask Oscar to tamper with the official German report that describes him as a terrorist, for the sake of their family, which Oscar reluctantly agrees to do when he realizes his position as Colonel von der Beck's pet might soon be compromised. But Jeanne refuses to just sit and wait for her doom to be sealed. Maybe Marcel - who, at the same moment, happens to be posing as a Kommandantur soldier in order to lay his hands on a map describing the building of the Atlantic Wall, while Léonoff and Noël are waiting for him outside - will be able to help her? As for Oscar, if he does want to recover the incriminating report, he's gonna have to barge in on the birthday party of Angela, Von der Beck's daughter, who's celebrating with Klaus and Müller before her father returns from a firing squad session. Phew, it's getting crowded in here, right?