Kavárna na hlavní třídě: On his first day in a new place, waiter Josef Kučera stands up for his old servant Bartoš and bellhop Svát. His actions earn him the distrust of the café owner Stýbl, the admiration of the maid Jindřiška, and the hatred of her suitor, the waiter Vacek. One evening, Kučera overhears a strange conversation between two guests and confides in the editor of Rudý právo Rokos. When a scandal breaks out about the bank robbery of the minister's son-in-law Zakhar, Rokos deduces from the conversation that it was a fake robbery...