JS Cheung, a superintendent in Explosive Ordinance Disposal Bureau of Hong Kong Police Force, went undercover seven years ago into the gang led by the most- wanted crime boss Blast. Cheung successfully uprooted the gang and arrested a few robbers including Blast͛s young brother Biao. However, Blast was on the loose and he swore he would be back for revenge. Seven years have passed and Blast kick starts his plan—a series of bomb attacks have sparked fear among Hong Kong citizens. To maintain law and order, Cheung must put Blast behind bars and he is ready to sacrifice his life to fight a though battle with the ruthless bomber.