In the late Tang Dynasty, General Qian Liu and his troops encounter a fearsome two-headed beast while battling river pirates. As the creature escapes to the Qiantang River, it unleashes destruction, threatening the lives of all in its path.

Dedicated police detective Ma Zhe is tasked with solving a series of brutal murders in a rural Chinese town. As pressure mounts from his superiors, a hasty arrest is made, but while his colleagues celebrate, several clues push Ma Zhe deeper into a desperate investigation of his own.