​ During the Mid-Autumn Festival, Su-Ling’s small village is planning a rebellion against the Mongolian invaders – and Su-Ling wants to help! Can she use her wits and courage to deliver a secret message hidden in a box of mooncakes, without getting caught by Mongol guards? Set 800 years ago in the Yuan Dynasty, this thrilling tale is based on an ancient Chinese legend, which is explained in the educational endnotes.