Jackie Chan is back as super cop Chan Ka-kui in this, the fourth Police Story outing, and heart-pounding action is sure to follow! Now working in conjunction with the CIA, Jackie is on a dangerous secret pursuit of nuclear weapons smugglers through the Ukraine. After losing the subject, Tsui, and suffering hypothermia but gaining a valuable lead, he is asked by the Russian FSB to follow it up in sunny Brisbane, Australia! Tracking down the smuggler's family he convinces Tsui's beautiful sister Annie that he is a friend. Can he maintain the ruse and locate Tsui before it's too late?