Gu Mingyuan, a legal elite who returned from studying in Japan, appears to be the trusted secretary-general of the Japanese military headquarters, but in fact he is an underground anti-Japanese intelligence agent code-named "Nightingale". When the Wang Jingwei Group secretly negotiated peace with Japan and intended to establish a puppet regime, Gu Mingyuan took a risk and obtained this key information related to the survival of the Anti-Japanese War. However, a traitor appeared within the organization, his contact person "Thrush" died, and all communication channels were cut off. Under the suspicion and temptation of Takeda Kenji, the head of the Special High School Course, Gu Mingyuan had to deal with alone in the isolated city, struggling to survive among the Japanese army, Wang puppet spies, military commanders, and foreign forces, trying to send intelligence enough to change the war situation out of Shanghai. The life-and-death game between double agents in the enemy's heartland, the real details and dangers of underground work in occupied areas, the secret contest behind major historical events, and the human test of trust and betrayal.
