The autumn of 1938, Shanghai Concession. Surgeon Zhou Huaian maintains his dignity between the scalpel and disinfectant every day. Until a special "patient" knocked on the door of the clinic with a gunshot wound, and three incomplete secret codes were sewn under the skin. To save or not to save? The cable pointed to an imminent massacre, and his family across the Suzhou River was at the center of the massacre plan. Zhou Huaian put down the scalpel and picked up weapons he never thought he would touch - lies, trust, and a death scam in a race against time.