For the past few months, British Prime Minister Tony Blair has been fighting the biggest political battle of his career. Caught in the center of a high stakes political storm, he tried to personally bridge the gap between the United States and its European allies -- particularly France and Germany -- over the impending war in Iraq. FRONTLINE examines the roots of the discord within the Western alliance, the perilous role Blair has played, and the stakes for him and the West should this old alliance fall apart.