1944during the war of resistance against japanese aggression, tang fei, a secret intelligence worker of the communist party of china who invaded the puppet manchu-linhe police department as the criminal section chief, under the leadership of cheng guoxun, secretary of the linhe provincial party committee of the china underground party, and grasim, director of the soviet far eastern intelligence bureau, carried out the "mudanwula" strategy of the soviet far eastern intelligence bureau. ddd。 tang fei sneaked into the security bureau and met section chief cai meng, an anti-japanese democrat who sneaked in due to national hatred and family hatred. then, with his bravery and agility, he gained the trust of his boss narita and became an important member of the security bureau. but the insider in the far east intelligence agency caused tang fei to fall into the trap designed by fukuhara and expose himself. general grasim of the communist party of the soviet union decided to exchange tang fei with an important japanese spy, but tang fei was unwilling to organize and pay a meaningless price. finally, with the assistance of the secret intelligence workers of the communist party of china and the soviet union, tang fei successfully completed the mission with his superhuman wisdom and courage. the play tells the story of our party's emotional workers witty, bravery and with their special loyalty and fearless courage, outstanding contributions to the victory of the anti-fascist battle.