In 1939, Shanghai fell to the iron heel of the Japanese army and became a secret battlefield where various forces competed. Han Shu, a young man who was born into a family of a puppet Manchukuo officer, arrived in Shanghai with the disguise of a "loyal servant of the empire" and a top-secret mission to transport the Japanese army's latest Type 92 cipher machine. As soon as he got off the train, he dealt with the situation with coldness and efficiency, winning the attention of the Japanese and puppet spy leader Li Mosheng. He was regarded as the sharpest "blade of the empire" in his hand...
