This story is about Mücke and Walfisch. They also have regular names, but Walfisch invented Mücke's nickname and Mücke came up with Walfisch's. However, that was a long time ago, and that's not what this story is about. The grandfather and his granddaughter live in Riga, Latvia, and they often enjoy spending time together. Mücke always has many questions. "Walfisch, why don't you greet people?" she asks one day straightforwardly. She had been taught to greet everyone everywhere, even the grumpy shopkeeper in the corner store. It's nothing but polite. The grandfather struggles to find an explanation, but Mücke doesn't find it plausible. She won't give up on her plan: the grandfather must learn to greet people, even if that wasn't customary in the past. And when Mücke sets her mind to something, then...