In 1930, Gu Yanzhou returned to Shanghai and entered an unnamed intelligence training ground.
In the first class, the instructor did not talk about loyalty, nor did he talk about guns.
He speaks only of silence.
From that day on, Gu Yanzhou began to understand that spy war is not a passionate charge, nor is it a slogan. It is hidden in the altered files, in the eyes of the concession patrol, in the records behind the bank counter, and in every question that cannot be asked.
In the Shanghai concession, secret agencies, newspapers, banks, docks, and radio stations, various forces intertwined in the dark. Some people offer opportunities, some set rules, and some lock the truth in a drawer.
What Gu Yanzhou has to do is to survive within the rules and see the situation clearly in silence.
This is a road to espionage that starts from the training ground.
