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In 1968, the Yellow River in Shandong dried up and turned into a small lake shaped like a fish head. No crops grow near Guitou Lake, and people in the surrounding villages make a living by boating on the Yellow River. Boat releasing is an ancient livelihood on the Yellow River, and it is divided into four factions: "sweeping sand", "retrieving corpses", "burying people" and "keeping spirits up". Each faction has its own rules and taboos. Wang Wudou, the leader of the "Taosha" boat gang, fished out a strange corpse when he was putting the boat out, but it ended up being carried on his back and sank into the river. Some people said that he must have offended the river god. Thirty years later, after graduation, the protagonist Wang Yan joined the Shandong Provincial Geological Bureau. While tracing the whereabouts of his friend Lao Yu, he discovered that there was an inexplicable connection between himself and Guitou Lake in the Yellow River. During the step-by-step investigation, he discovered a shocking secret hidden in the Yellow River...