A Chinese man and his grandson are captured by an Arab army and taken to the sultan, who spare their lives when they demonstrate to him how they can make "clouds," i.e., paper. This is based on a true incident, though not with a man and grandson. During the process of making the paper, I really couldn't figure out what they were trying to make, until the very end. It would have been nice if the book had included some simple step-by-step instructions for making paper the way they did.
A tad disappointing, but not bad.