Zong Xinyun

Police officer Wu Weijie was discovered by He Biao, the head of the gang, during an undercover operation, and was injected with drugs to lose his memory. Policewoman Lin Simin, her former lover, traces Wu Weijie’s whereabouts and helps him restore his memory. The two work together to destroy He Biao’s lair in a mysterious overseas port, and capture He Biao and his men, so that the light of justice can be revealed.

1942, Nanjing. Following a series of assassination attempts on officials of the Japanese-controlled puppet government, the Japanese spy chief gathers a group of suspects in a mansion for questioning, and eventually, torturing. A tense game of "cat and mouse" ensues as the Chinese code-breaker attempts to send out a crucial message while protecting his/her own identity.