In 1942, policeman Fang Hua arrested Pei Shiying in the French Concession in Shanghai. On the surface, he was maintaining order for the Japanese, but in fact he was the deepest nail in the underground party's agenda. After Lao Zhou died on the line, he became a kite with its string cut off. No one could prove his identity, and the organization even began to suspect him of rebellion. At the same time, the Japanese military headquarters was planning a large-scale raid on the base areas in northern Jiangsu, and the defense map was hidden in the safe of the Hongkou Military Police. Pei Shiying must get this picture to prove his innocence before he is eliminated by his own people. But the bigger problem is - he hasn't received any instructions for three months, and everyone in the patrol room, the translator of the Japanese Gendarmerie, and even the newsboy he rescued seems to have a secret.
