In ancient China, a skilled assassin named Zeng Jing comes across the mummified remains of a mystical Buddhist monk, which are rumored to possess great power. Desiring a peaceful life, she decides to hide the remains and change her identity, marrying a humble messenger named Ah-Sheng to settle down. However, her past as a trained killer catches up with her when a group of deadly assassins from her former gang, the Dark Stone, begins a relentless pursuit to recover the monk's remains and bring Zeng Jing back into their fold.

As the assassins close in, Zeng Jing’s carefully constructed new life begins to unravel. Her skills are put to the test while the secrets of Ah-Sheng’s true identity gradually come to light. Each encounter with her old comrades pushes Zeng Jing closer to revealing her hidden past and unleashing her lethal abilities. The high-stakes game of cat and mouse culminates in a deadly confrontation that threatens not only Zeng Jing but the peaceful life she has fought so hard to protect.