王海南屡條次偷渡不成功，被遣返大陆，不用判刑。一次，王海南遭前度女友丽芳刺伤，案子交由尚琪侦辨。海南伤重去世，丽芳坦承杀人罪，不肯透露动机，上方施压力将此案速速判决，尚琪认为事有可疑，追查之下，才知道个中有段不足为外人道的原委，而一切一切只能存在社会档案里！

In Shanghai, a son of a Chinese official is found stabbed on the street. But when the culprit is apprehended, she refuses to reveal her motives. Meanwhile, a police officer grows suspicious of the officials' rush to close the case.