The spring of 1948, our party's senior agent Yan Wenchuan returned home to Jiangcheng with a great secret task, just enter the house, he suffered a be struck with fright catastrophe, inadvertently let Yan Wenchuan became the central figure in the Kuomintang secret struggle. However, even the local Party organizations do not know the true identity of Yan Wenchuan. In order to keep secret, underground decided to temporarily detained him, and put a hot potato to a just returned from the Soviet Union "swallow" type of young women cadres Dou Wanru. Dou Wanru therefore came to Yan home, pretending to be Yan Wenchuan's nanny, monitoring his every act and every move, but because the impulse, she often will be careful not to expose their. At the same time, the classmate Lou Haiping repeatedly recommended, Jiangcheng juntong station Chen Gongru because cherish talents, Yan Wenchuan will move into the military force. Since then, he and secret service agents have to master, to complete his special mission, one with totally do not understand, just began to dislike his revolutionary comrades sinus Wanru "wits", began a full of danger and smile "romantic houseful".