108, Caoxiewan Road was where private detective Sha Qiuke worked and lived with his son Sha Xiaoqiu. As Sha Xiaoqiu grew older and more mature, his incredible capacity for observation and reasoning would gradually appear. When Sha Xiaoqiu was ten years old, Sha Qiuke took over a complicated trafficking case. After experiencing a great deal of ups and downs throughout the process, eventually a key breakthrough was made. But just when they were about to make more progress, something no one would have ever expected happened....