Produced by Jackie Chan, it stars Darren Chen, Fu Meng-po and Liu Yaoyuan in the lead roles.

[4][5] In 15th-century China, a quick-witted government official named Tang Fan (Darren Chen) is the best detective in Beijing.

When a nobleman's son is murdered, Tang Fan meets martial arts specialist guardsman Sui Zhou (Fu Meng-Po), who is investigating the disappearance of the Crown Prince's study partner.

Realizing that the two cases are connected, the devious and powerful imperial eunuch Wang Zhi (Liu Yao Yuan) convinces the unlikely duo to team up.

As they dig deeper into the crimes plaguing the Great Ming's capital, the trio realize that something very sinister is afoot – including a plot to launch a bloody coup.