1936 Shanghai City, a secret room murder case and a mysterious warhead.
Li Yun, the inspector of the concession, went against the trend to investigate the murderer and was involved in the four-way game between Japanese spies, the government, the Youth Gang, and the underground party.
The old acquaintance Qian Jin hid all the secrets and guarded them silently in the dark.
In troubled times, sneaking with swords in hand, lurkers are looking for a way to save the country in the darkness.
