During the Anti-Japanese War, a group of highly trained female spies hold the key to defeating the enemies. Guo Chun Guang 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 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. Can Li Feng Huang lead Code Thirteen to intercept their enemies’ transmissions and win the war?