In book 4, Ayuya's revenge for her father's death is described. In the desert, in a sandstorm, in the middle of a tribal war, this girl kills all but one tribal leader. We also find out more about Pei Xinyan, the man who finally saves and protects Ayuya. This part of the series is really dark, grim and violent. The humor and lightness of the first books has evaporated, which made this hard to stomach at times.