Before his wife was murdered, Inspector Mann Cheung (Simon Yam) was a model to young detectives. However, with his wife's death, he was indulged in deep sorrow and became downhearted and dispirited. Not only was his detective image affected, his relationship with his daughter Yan (Wada Hiromi) also went downhill. The new superintendent Koo Kwok-keung (Fala Chen) assigned him to take charge of a series of kidnapping cases. Several triad leaders were kidnapped, held to ransom and murdered. The modus operandi was violent, brutal, professional and efficient. Mann soon discovers that the gang of kidnappers were former members of the Special Duties Unit, led by Sam Ho (Michael Miu) and his girlfriend, Can (Qu Ying), a former member of the VIP Protection Unit, who were familiar with the police modus operandi and were able to escape from apprehension. Sam also discovers that Mann is after him. A duel to the death between the two elites of the police force is ensured.