In 15th-century China, a quick-witted, senior-ranking government official named Tang Fan takes a break from his routine activities in order to investigate a murder, teaming up with martial arts specialist guardsman Sui Zhou in a bid to solve the case. When the peace-loving landlord of the house Tang Fan is renting is found dead, the duo investigates. It is an apparent suicide, but the investigative pair quickly realizes that something looks amiss.
