In the late autumn of 1934, the Haihe River in the British Concession in Tianjin was filled with fog. Forensic doctor Song Mingxuan took out half of a jade ring from the bun of famous Peking opera actress Shen Moqing. The strangulation mark on the side of the body's neck hides a mystery, which is consistent with the other half of the jade ring found in the banker's murder case three days ago.
Jiang Wan stirred up the costume with a gun, and used begonia petals soaked in alum water to reveal a map of the dock warehouse on the corpse spot. The German ordnance number was marked on the record, pointing to the Jardine Matheson freighter. At the horse racing meeting, Song Mingxuan discovered that the betting number was related to the Japanese military number. Xiao Doudou found the Manchu Iron Badge under the armpit of the costume, which revealed the secret frequency of the "Xuanhe Group". Jiang Wan's password implies that the "Zhongyuan Company" K line is related to the longitude and latitude of Tanggu Fort.
During the pursuit at the Haihe Pier, firearms and rice exploded from the warehouse, the Qing Gang's tattoos exposed the secrets of smuggling, and the bite mark on Shen Moqing's finger turned out to be the draft code for the smuggling ship.
On the top floor of Quanyechang, the notches on the soundtrack reveal the groundwater level in Tianjin calculated by the Japanese army. During the Holy Communion ceremony, an assassination list was etched into the wine, with Song Mingxuan's father at the top of the list.
On Christmas Eve, the Japanese military column exploded and the stocks fell into the Haihe River. Xiao Doudou found the code book, Jiang Wan pointed the gun at the consul, and his wife's cyanide capsule had the same origin as the murder poison.
On a spring day, the jadeite finger melted into the molten iron, and Song Mingxuan witnessed the arms box sinking into the river. Jiang Wan deciphered the secret message and revealed that "Master Xu Zai" was the order to hoe the traitor. Shen Moqing's warning emerged - the cholera strain had spread to North China along the water transport network.
