2000年10月9日上午，怀化市公安局侦察科副科长张南生正向警校实习生介绍破案经验时，桌上的电话铃急促地响了起来。江苏省常州市公安局的同行在电话里说：10月5日下午4时许，武进市公安局接到小河镇个体老板上官娟报案，说她家3岁的儿子“元元”突然失踪了。与此同时，租住在 On the morning of October 9, 2000, Zhang Nansheng, deputy chief of reconnaissance department of Huaihua Municipal Public Security Bureau, was briefing the intern at the police academy on the case-solving experience. The phone on the table rang rapidly. Public Security Bureau of Changzhou City, Jiangsu Province, colleagues said on the phone: at 4 pm on October 5, Wujin City Public Security Bureau received an individual boss Xiaojuan Shangguan Juan reported that her 3-year-old son, “Yuan” suddenly disappeared . In the meantime, rent in