In the autumn of the twelfth year of Yongchang, a salt merchant in the south of the Yangtze River suddenly died in a secret room. He clutched a gilt gold ingot in his hand, with the words "It rains at the third watch of the night, the soul returns" engraved on the bottom.
Lu Xunzhou, a secret agent from the Criminal Department, was ordered to investigate the case, but Pei Yan, the commander of the Jinyi Guards, intervened.
One pays attention to the chain of evidence, and the other is good at arresting people first and then interrogating them.
The two incompatible people were forced to join forces because of this blood-stained ingot, but they did not know that they had entered a shocking mystery that lasted for ten years——
Yuanbao is the key to uncover the bloody truth of the water transport tragedy three years ago;
Yuanbao is the bait to fish out the remnants of the previous dynasty in the seven-star chess game;
Yuanbao is an oath, which tightly connects two lonely hearts in life and death.
From the houses in the south of the Yangtze River to the imperial mausoleums of Jinling, from the windy sand in the north of Saibei to the snowy mountains of the Western Regions.
They walked through mountains of corpses and seas of blood, explored the ghosts in people's hearts, and finally discovered:
The most difficult mystery in the world is not a strange case, but how to keep a little bit of original intention in a troubled world.
"Lu Xunzhou, if these mountains and rivers need to be washed with blood, I am willing to hold the sword and carry the lantern with you."
"Pei Yan, let's take this ingot as a contract - we will guard the mountains and rivers together until death."
Purpose: "The ingot is a mirror, reflecting the greed of people; the two swords are an oath, guarding the purity of mountains and rivers."