A top-secret file recording the truth of the mystery reveals three shocking cases:
When the bride in red beats the government drum in the middle of the night, the corpse is mysteriously resurrected in the court hall;
At the scene of a serial murder, only non-human footprints and half of a fox tail were left;
When the legend of Shuiguihe intersects with real-life murder cases, every villager is hiding an ulterior secret.
Jiang Lin, the prosecutor who was demoted for misjudgment of the case three years ago, was forced to join forces with a mysterious gang to pursue the truth, but found that all the evidence pointed to a strange legend that had been covered up by history for seven hundred years.