The naughty little boy, Dai Doudou, is often told to keep quiet by his mother when he's being too noisy. He's told to keep quiet while eating, while walking, and even when bouncing a ball...and so it was that Dai Doudou decided to become a gentle, quiet little mouse, free to roam around wherever he pleased. His father agreed to the idea, and himself decided to turn into a mouse. In the end, even his mother, who wanted everyone to “keep quiet”, turns into a mouse. The book employs gentle humour to describe a child's escape from a stifling family life into the realm of imagination; looking at modern, everyday problems through a lens of fantasy and illusion.