Zhang Yan and Fan Zhiqin and Yang Guangde and Feng Xu four comrades in arms, Zhang Yan County police team vice captain, although culture is not high, but the wisdom, when handling to seize the key, also cracked a lot of cases, he often escape from death in a great catastrophe, so called: "Zhang die", "a cat has nine lives". Zhang Yan or personality, humor, upright police, because the clean against comrades Fan Zhiqin and Feng Xu, his wife also lost their jobs. He for Fan Zhiqin foster daughter Zhang Lin and not known. Because of his mistakes punished down to the work of the police station, in the "mother lost a cat" "neighborhood dog dispute" Internet cafes "liar" "gamblers" "missing children" cases and apprentice Wanshan forged profound mentoring, daughter Zhang Lin and Wanshan become lovers. In an operation, his wife Li Yumei from Zhang Yan, Yang Guangde to perform the task to replace him, the results Yang Guangde honor killed, Zhang Yan and Li Yumei divorce. Zhang Yan was seriously injured in a hunting prisoners, in the hospital, learned that he had been got liver cancer late, Zhang Yan explained his loyalty to the occupation in his short life, religious faith.