Ten years ago, Yanmen was imprisoned for a night of bloodbath. The entire Shen family was beheaded, and the youngest son Shen Cibai faked his death and escaped.
Ten years later, he returned to Wei Jing with the emperor's letter, incarnate as a foreign edict, and investigated the case under a secret order. However, he unexpectedly uncovered an old secret edict case that could shake the three assistants and nine princes and shake the foundation of the court.
The frightening words of a madman, the poisonous poison of a child's corpse, the remnants of the gangsters, and the fighting within the court, all the mysterious cases point to the top-secret chess game of "substitution for edicts".
He was originally an investigator, but he was drawn into the game step by step.
He uses the emperor's letter as a blade to cut through the fog and reveal the truth:
"I, Shen Cibai, do not seek revenge or meritorious deeds, but only seek an answer - for whom did the thirty-seven members of the Shen family die?"
