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In 1925, the mountains and rivers were swaying. Shanghai, which was thought to have settled down, once again stirred up trouble due to the appearance of a charred corpse in the secret vault of the British Consulate. The deceased held half of a yellowed old photo, which involved a shocking and unsolved case that was deliberately covered up many years ago and related to the fate of the country. **The gears of fate turned, allowing Qiao Chusheng and Lu Yao, who had parted ways, to be side by side again in this critical moment. Qiao Chusheng, trapped in the whirlpool of power and loyalty, used thunderous means to suppress demons and monsters, but could not hide the loneliness in his brow; Lu Yao, wandering on the edge of science and faith, used astonishing wisdom to peel off cocoons, but always lost his mind at a certain moment. One of them is a blade in the dark night, and the other is a lamp in the fog. In a dangerous city surrounded by foreign powers and traitors, they use their bodies to participate in a life-and-death chess game. In the face of the great interests of the family and the country, both love and hatred need to be kept silent. When the truth of an old case tears apart the past, and when trust suffers a fatal blow, can they hold on to the unburnt mountains and rivers in the flames of a prairie fire, and also hold on to the feelings that cannot be tolerated in the world, but have long been integrated into their flesh and blood? When the two detectives come again, they learn about the hatred between the country and the family, as well as the truest and darkest unresolved feelings in their hearts.