The film tells the story of a series of homicides in Jingu City after China became a Republic. The police are at a loss. Duan Yuhao and Qi Wei, who uses Feng Shui to solve cases, investigates what happened and leads to the Rakshasa Serial Murder many years ago in a mysterious underground city. The protagonists and others finally explore the truth behind the case together and find the real murderer....

武林中有一把神剑名为“玄天剑”，得此剑者得天下，江湖之中各门各派为了它一直纷争不断。直到名剑门掌门马啸天重创鬼谷派闫婆夺得此剑，一切尘埃落定。马啸天想把掌门之位传给他的徒弟鹿九，并将玄天剑交给他。不料马啸天却突然被杀，玄天剑也不翼而飞，鹿久被当成了凶手，这一切的背后隐藏着巨大的阴谋...鹿九怎样才能洗清嫌疑，为师父报仇雪恨？幕后黑手究竟是谁？...