The play tells the story of the British concession inspector Feng Jiusi as an underground intelligence personnel, in complex relational structure, in cruel environment revolution, endure loneliness and temptation, the final forging into tolerance, calm, resolute strong communist soldier's story. In 1941, Tianjin, a heart to the Party of the British concession detective von Jiusi, for faith, and the revolution friends against the enemy, unexpectedly involved in danger, witnessed one revolution friends has died. Feng Jiusi vowed to track down the killer, to justice. Feng Jiusi, casual and elegant bearing, wise and brave. And and he is a man and his wife's brother and friends British concession municipal police commissioner Zhou Xiaocun is of Ayutthaya deep joy, anger, not seen in the face. Just in the atmosphere of the terrorist assassination, with two people continue to investigate, the accident found that the murderer and the Chinese Communist Party members Yang Bingxin has a mysterious relationship. At the same time, the Japanese commander of the Tianjin garrison of concession division forced Yao hinder her lover to Kokura Sherlock Feng Jiusi. Feng Jiusi case analysis found the contact with our party an important action of failure, but also to Yao in danger. With the underground station and superior sacrifice, it became tense, threatened by growing crises. At this time von Jiusi got a clue, but found that his brother-in-law Zhou Xiaocun unexpectedly is a juntong spy, and master of the Japanese military intelligence. Unexpectedly Zhou Xiaocun also found Feng Jiusi is gradually touching dangerous red line, is in such a chaotic moments, Kokura hope will catch the Feng Jiusi Zhou Xiaocun! At this time, between Feng Jiusi and Japanese, juntong battle horn has just sounded, but in the face of multiple threats and dangers, Feng Jiusi still keep personal beliefs, after arduous struggle, finally won the final victory, curb the enemy's plot.