The story takes a place in the city of Shi He Zi in Xin Jiang province, Northwest of China. While Hongqi Zhang, a very experienced city prosecutor is preparing his retirement, a transferred prisoner Yunping Zhang disobeys the prison discipline officer’s order. This report really troubles Hongqi Zhang tremendously. With a series of in-depth investigation, Hongqi Zhang finds many questionable points in the case. After 7 year’s hard work of Hongqi Zhang and other righteous persons, Yunping Zhang and his nephew regained freedom.