One, two; yi, er. Side by side, two bicycles, Lunzi and Huangche, come out of the factory. Side by side, they watch the city of Beijing from their shop window. Then a young girl comes in and buys Huangche, rolling him away from Lunzi! With the help of a delivery boy, Lunzi begins an epic race to find her friend that introduces readers to all the sights and sounds of Beijing.