Andrew Carter, an instructor at the Haigu Police Training Institute, secretly joined the Chinese Communist Party while still in school. After graduation, he entered the British Concession Police Department as a patrolman and was noticed by the Military Statistics Bureau's Haigu station, which recruited him as a communications agent. Later, the Japanese also considered him an ideal candidate for development. Originally, Andrew Carter only wanted to use his patrolman identity as a cover for his work, but suddenly found himself the target of pursuit by all sides...