The story takes place in the "Spy City", a large southeastern coastal city in the 1930s. As the international situation changes, all forces gather here. Zhang Yuanshan is an experienced but embarrassing-looking agent. He was accidentally involved in an espionage case involving international secrets, and had a head-on confrontation with his calm and rational opponent Lin Manqing. The two experienced many cat-and-mouse confrontations, but were forced to join forces to investigate a mysterious case. With the help and trouble of partner Song Ziteng and double agent Ouyang Jin, the clues gradually became clear. However, the real enemy is far more complex than imagined. The three volumes are like three "espionage upgrades", with clues reversing layer by layer, crises continuing, and the truth hidden behind affecting everyone's life and death. The main plot of the book is compact, and the details contain humor, showing the warmth of human nature and the growth of spies behind the smoke.
