How can crooked potatoes be turned into straight fries? This question prompts Leo and Rosa to embark on a grand journey through Germany. At 24 different locations, the siblings learn a lot about tricycles and cars, art and carnival, fairy tales and myths, technology and tradition, chancellors and kings. They celebrate Carnival in Cologne, eat at the fish market in Hamburg, experience history in Berlin, marvel at technological ideas in Munich, search for the beautiful Loreley along the Rhine, ride a steam locomotive to the Brocken, and take a cable car to the Zugspitze. Rosa knows a lot about the cities and sights, but Leo prefers to try things out for himself. Leo and Rosa's travel route: Frankfurt, Mainz, Loreley, Cologne, Zollverein Coal Mine, Kassel, Bremen, North Sea, Hamburg, Brocken, Wartburg, Stuttgart, Neuschwanstein, Zugspitze, Munich, Dresden, Leipzig, Potsdam.