In 1941, Shanghai was isolated. Chen Shu, a young shopkeeper of a traditional Chinese medicine dispensary in the French Concession, appears to be running his ancestral business, but is actually the "Night Owl" of the CCP's underground intelligence network. He deals with the fragrance of medicine, abacus and code words every day, conveying information about the life and death of the northern Jiangsu base area. Until an encrypted message broke the calm - the Japanese special "Mei Agency" had locked the pharmacy, and his contact person disappeared by the Suzhou River three days ago.
