Ten months after the murder of Yan (Tony Leung), Ming (Andy Lau) is relegated to the backseat of mundane office work, pending internal investigation. Meanwhile, a new star, Yeung (Leon Lai), has emerged in the police force. His meteoric rise mirrors Ming's very own before Yan's death.
Suspecting that, like himself, Yeung could be a mole from the triads, Ming begins his clandestine investigation on Yeung, only to find himself constantly shadowed by a mysterious cripple called Shen (Chen Daoming). He learns that not only is Shen a former business partner of Sam's (Eric Tsang), but he is secretly linked to Yeung.
Only too late does it dawn on him that he has already been cornered to a dead end by Yeung and Shen¡K