London is on red alert. Will Robie, as the US government's most lethal assassin, is called in to foil a terrorist attack on the London Underground. An attack serving as a test run for a much larger plot to take place on US soil. Trained to neutralize threats without leaving a trace, he's an indispensable asset to his country. But then reports come in that his mentor, Blue Man, real name Roger Walton, has gone missing while visiting his home town in...