Crimson Viper is a deadly assassin and well known thief. S.I.N. (Shadaloo Intimidation Network) is very aware of Viper's skill and attempts to recruit her. But Viper has an agenda of her own, and S.I.N.'s infiltration was a part of this. Meanwhile in London, Abel is trying to solve the puzzle of his past, and after beating the hell up of Birdie, he now has a name: Vincent.