During the reign of Emperor Taizong, the Tianji Department was established, directly under the inner government, to investigate difficult and important cases that the Three Law Departments did not dare to touch. The head catcher Gu Changan makes good use of the "Question Step" to apply pressure in silent places to break the situation; Yan Shisan's sword energy has entered the true state, and the "Dead Game" can detect the remaining traces in space; Jiang Yushuang possesses the "Thousand Mirrors" and can detect the secrets of the human heart and traces of breath.
Three Chairs, Three Geniuses begins with the murder case in the secret room of Wangchuan, the richest man in Nan City, and encounters strange cases such as the fake suicide of a Hanlin Academy bachelor, the impersonation of a new top scholar, and the suspicion of poison in a southern town. The clues are entangled layer by layer, involving the secrets of the "Jingting Incident" fifteen years ago, the secret manipulation of Qixing Pavilion, the power struggle in the three princes' palaces, and the old grudges about the destruction of the Tiandao Sect.
The officialdom is operating behind closed doors, rivers and lakes are intertwined, and insiders are lurking to leak secrets. They work step by step in the cracks, hiding clues to the remaining cases in secret files, and looking for hope in desperate situations. When the identity of the eighth person surfaced, and when the truth of the old case and the new case resonated, the three Tianjis always adhered to their original intention of investigating the case. In the whirlpool of intrigues and the shadow of swords, they uncovered a huge black network spanning the court and the rivers and lakes.
