Twelve-year-old twins Mei and Yun Wu may have a secret that makes them different from the other village kids, but in the weeks leading up to the Mid-Autumn Festival, they are exactly like everyone else in excitement--their grandfather's famous mooncakes have caught the attention of the Emperor of China himself, who is sending his son to the village to see if they live up to the legend. The night of the Festival brings with it more than excitement, however, when disaster strikes, and nightmares follow. The twins must band together to rescue their grandfather and village, but even their bond may not be strong enough to withstand ancient magic, curses, and revenge.