Shanghai, 1936: Shadows in the Undercurrent

Shanghai, 1936: a locked-room murder and a mysterious bullet.

Concession detective Li Yun defies the odds to investigate the killing, becoming entangled in a struggle among Japanese spies, the Nationalist government, the Green Gang, and the underground Communist Party.

A wealthy young woman he once knew harbors countless secrets and silently protects him from the shadows.

Amid the upheaval of a turbulent age, an undercover agent moves through the darkness, seeking a way to save the nation.