Helene rides her motor scooter by Fritz, the “White Mouse,” every morning as he directs traffic through the intersection. Though he yields the right-of-way to her often, they have never spoken and she wants more than his friendly gesture. Helene makes a plan to get to know him better by committing a deliberate traffic violation. Fritz takes action and orders her to attend his traffic safety school where they get to spend more time together. However, when fellow motorist Mrs. Messmer must pay a monetary fine, she feels discriminated against and complains about Fritz to his supervisor. But her formal complaint doesn’t stop the wedding between Helene and Fritz.