This book tells us a thrilling treasure-hunting story. Before he died, Yingzi's father, a communicator for the underground party of the communist, told Yingzi to hand over a diary containing the secrets of the Empress Dowager's golden cucurbit to the liaison officers of the liberation army. Yingzi and her friends Xiao Shanzi tried various ways to protect the diary while trying to find the liaison officer. After they experienced numerous thrilling conflicts and hiding, they finally accomplished the task. The language of the novel is precise and idiomatical and the plot is compact and full of tension. It also smartly combines historical and cultural elements with adventurous and mysterious stories. Meanwhile, it successfully depicts an image of children with strong will and perseverance, which makes it a rare children's novel.