Shadowed by a Japanese intelligence officer Tanaka (Ken Watanabe), Soames' investigation quickly centers on a charismatic local gangster, Anthony Lanting (Chow Yun-Fat) - and Lanting's beautiful wife, Anna (Gong Li). Before long, Soames and Anna are involved in an affair that will put everything they have at stake. As national loyalties are traded fast-and-loose for those of the heart, Soames and Anna must race to solve the mystery and make it out of occupied China before the city's collapse.