During the Anti-Japanese War, a group of highly trained female spies hold the key to defeating the enemies. Guo Chun Guang (Li Chao) is a highly trained spy for the Communist Party who goes undercover as a dentist in Shanghai to gather intelligence on the enemies. Gu Xue Feng (Li Zhu) becomes the new Shanghai stationmaster for the Kuomintang (KMT) military regime and is tasked with forming an all-female special force known as Code Thirteen.