A serial killer is on the loose and it appears to be a woman—her target, adulterous businessmen. After picking them up in bars, she brutally tortures her victims before decapitating them. Meanwhile, Hong Kong detective Johnny Mann is still struggling to deal with his dead father's legacy of corruption and triad involvement. His nemesis CK Leung is determined to bring Johnny into the triad fold and has now deployed the most dangerous weapon, his beautiful but deadly daughter Victoria. Falling into a downward spiral, Johnny is on the verge of destroying everything he holds dear while Ruby continues her terrifying murder spree. Johnny needs to pull himself together fast, because Ruby is getting nearer, and is closing in for the kill.