Grave Robber's Chronicles was the fourth book in the series. " Sea of Sand " was about Wu Xie, Fatty, and Little Brother's grave robbing activities in Guizhou and Yunnan, as well as their struggles with government forces and underground organizations. The background of the story was a secret area called "Xisha", where there were many mysterious ancient tombs and treasures. In the story, Wu Xie and Fatty got to know Little Brother because they were searching for treasures in Xisha. The three of them formed a tomb raiding team together. In the process of their exploration, they encountered many dangers and challenges, and also discovered many unknown secrets in the Paracel area. At the end of the story, they successfully found the treasure but lost many important people at the same time. The Sea of Sand had become one of the representative works of Chinese online novels and was deeply loved by readers because of its thrilling, complicated plot and rich characters.