Winter 1942, Shanghai. Military agent Zhou Keji's sniper scope locked the traitor Zheng Wenbin's head. The moment the trigger was pulled, someone pounced on him from behind - the assassination was a trap, the traitor did not betray, the bullet was aimed at himself.
From that moment on, Zhou Keji was dragged into a spy war in Shanghai that spanned three years. Matsumoto wanted to catch the mole, "Sewing Machine" wanted to release false information, the Military Police Special High School stabbed him in the back, the traitor repeatedly retracted his confession, and the postman delivered the last batch of documents deep in Hongkou. The three forces set up a trap for each other, and during one hundred and fifty days and nights of interrogation and lurking, the lives of seventeen people were exchanged for a piece of information to leave Shanghai. But Zhou Keji didn't understand until the last moment - he was not a chess player, he was the last chess piece dropped by Shen Ruolan.
