One and a half months before the National Day in 1950, on a night, the No. 201 Intelligence Office of our army stationed in Beiping received a confidential intelligence from the undercover agent "China No. 1" who had infiltrated into the Nationalist Party's intelligence agency. It was learned that a "Heaven No. 1" strategic plan targeting at the capital of New China had quietly begun.
Then, both sides simultaneously discovered that there were spies from the other side hidden in their own internal organizations. The situation facing Yuan, the senior leader of our intelligence department, was extremely severe - who is the enemy's undercover agent "Scorpion"? Who is the well-concealed "Silver Dragon"? Who is the murderer of our intelligence personnel 009? Has our undercover agent, Zhong Hua with the code name "China No. 1", been exposed? What are the specific details of the "Heaven No. 1" plan? Why are there so many bizarre aspects in the enemy's sabotage actions this time which violate the conventions?...