The protagonist carries home a 400-year-old bugle in perfect condition that he has stolen from the Richard Wagner Museum, where the bugle was exhibited in a sealed display box.
He describes to Anne-Catherine, how he had to climb onto a radiator and unscrew the display box in order to steal the bugle. He mixed his theft with moving around loudly in order not to raise suspicion from the cashier downstairs.
Anne-Catherine is displeased with him, because they already own a better bugle which they had stolen in Germany and he had broken her two rules: always wear gloves and never steal from Switzerland (since they had already been arrested there). His theft took place in Lucerne, the very city where they'd been arrested.
Fearing Anne-Catherine's anger, the protagonist suggests that he'd drive back to the museum to erase his fingerprints. However, Anne-Catherine decides to do that herself and asks him to take her there. He manages to convince her to let him drive.
They arrive at the Richard Wagner Museum, which is located in a beautiful location, a promontory in a gorgeously landscaped city park on the edge of Lake Lucerne. As Anne-Catherine heads into the museum with her handkerchief and a bottle of rubbing alcohol, he hopes they can find their peace again.
Anne-Catherine is inside the museum while the protagonist wanders around and awaits her return. A police car arrives, and the protagonist is promptly shackled and arrested, despite him having no stolen article in his possession. Anne-Catherine is not noticed by the police and she definitely seems quite frantic and confused as he is taken away.