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This book is a long mystery novel. The background of the story is an island city-Guiyun City. The protagonist is a group of people with secret identities who protect Turtle Cloud City. Unknown deaths occur frequently in Dongshan Hot Spring, and one person dies every seven days, making people in Guiyun City panic. As the leader of the descendants of the city's guardians, Lu Wuxie returned after hiding for eighteen years and began a secret investigation. Police representative "Leopard Police" Wang Liancheng, nosy hacker Cui Yipu, and clever and eccentric little girl Lin Mengni all joined in. There are various signs that the Blackstone clan, which has been dormant for eighteen years, is making a comeback. The relationship between the Blackstone Tribe and the Jinyiwei, the historical origins of Guiyun Island and Zheng He's voyages to the West gradually emerged, and the mystery of the Dongshan Hot Spring was just the beginning.