The film takes place after the July 7th Incident. A mysterious man in black appears in Shanghai under the Japanese rule. He assassinates the commander and senior generals of the Japanese Army Corps as well as the traitor Hu Fei. The Japanese female spy Yoshiko Kawashima was unable to determine who the mysterious man in black was. In order to reveal the identity of him, she pretended to be the No. 7 intelligence agent.
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