The mysterious and unsolved “Snowman” murder case rattles the city, with the killer taunting the Police with notes saying “Come to catch me” at the crime scenes. With a last hope of breaking the case, the chief calls back the dismissed and rogue detective, Liang Yan. While the local public defender, Yu Guo, has chance reencounter with his high school love, Hui-ru Zhu, as she gets embroiled in a homicide case.
神秘的“雪人杀人案”震惊了整个刑警队，凶手完美地消弭了一切线索，只留下一张“请来抓我”的字条，令警方的调查陷入困局。为了揭开真相，警队领导调来了蛰伏多年的神探严良，将最后的希望寄托在严良身上。见习律师郭羽在一起涉黑的债务纠纷中偶遇初恋女友朱慧如，为了帮助朱慧如，旧情未灭的郭羽伸出援手，不想却惹来了真正的麻烦……
