FRONTLINE examines the secret history of the Irish Republican Army (IRA) and its equally formidable political arm, Sinn Fein, which have waged a bloody campaign in Northern Ireland for over a quarter of a century. The film traces the history of the IRA and Sinn Fein, the most sophisticated guerrilla movement in the world, examining their tactics, weapons, and operational structures and assesses the chances of a final resolution to one of the century's oldest and bloodiest conflicts.