In the late Ming Dynasty, three sworn brothers who serve as the imperial secret police are dispatched to hunt down Wei Zhongxian, a eunuch politician who had been forced to resign from his influential post and exiled from Beijing. The brothers return successfully from their quest, only to find that their task was but the beginning of a strange conspiracy.

An imperial guard searches for the truth behind a conspiracy that framed him and his partners. The proof of his innocence lies with a wanted woman named Bei Zhai... but will she reveal what she knows? In this intense prequel to BROTHERHOOD OF BLADES, the only thing he can truly trust is his sword.

Luo Lianwu is investigating the death of his godfather Shen Qianzhe, but he finds out about Ji Yuankun's treachery. After the Shen's death, Ji Yuankun is framed to frame Luo Lianwu, and Zhang lets go of Luo Lianwu. The emperor pretends to be sick and the princess leaves the palace, all to draw out the rebellious people in the imperial court, and when the princess leaves the palace, she happens to save Luo Lianwu, who then also saves the princess from the assassin. After returning to the capital, Luo Lianwu reunites with Zhang Jean Lei, but Liang Zhuo discovers him and Liang Zhuo