Winter 1941, during Shanghai’s isolated-island period. The Wang Jingwei regime’s Special Services Committee, known as the Tokko, the Military Statistics Bureau, and the Chinese Communist underground are locked in a tangled struggle, and the situation is treacherous and unpredictable. Gu Yuanshan, a Communist underground agent codenamed “Wind Listener,” is embedded in the inner circle of the Wang Jingwei regime’s intelligence agency, “No. 76.” As a brutal operation to purge moles unfolds, he must protect his cover while getting a top-secret intelligence document concerning the situation in southern Anhui out of the city.