In the winter of the second year of Xuanhe's reign, the strange corpse of Agula, the leader of the Mongolian caravan, was discovered at the Hangzhou water transport terminal - the blood hole in his chest was frozen, and he was holding the secret order of the Jin Kingdom. The body was covered with Saibei badger oil that should not have appeared in the south of the Yangtze River. Magnet dealer Tan Rui was forced into the whirlpool, and he teamed up with the iron-faced criminal Shen Mo to investigate, and discovered that his father's mysterious death twenty years ago was actually entangled with a shocking conspiracy: Jin Dynasty spies, Korean crossbows, and Cao Gang traitors colluded at all levels to use the power of magnets to divert the Yellow River in an attempt to subvert the Song Dynasty.
From the Tanzhou magnet mine to the armillary sphere platform in Bianjing, from the Yinshan tent to the Tuoji Island sea array, Tan Rui peeled off the cocoon and uncovered the horrifying secrets of magnets to induce tides and arrange corpses. He also faced family blood feuds - his father and Shen Mo's ancestor Shen Kuo were both martyrs of Su Song's "Magnetic Pivot" plan. The Cold Poison Girl's pattern, the star map of the Liao Kingdom, the remnant seal of the magnetic key... When the old course of the Yellow River was torn apart by a magnetic storm, Tan Rui had no choice but to risk his life to break the "Xuanji Jueji" left by Su Song, and find a way out for his family and country in the game between the human heart and the magnetic pole.
