What if the end of war has already been designed? ZERO revives the most rigorous disarmament plan in history-the Clark-Sohn blueprint-and updates it for the AI age. It outlines a 12-year staircase to global disarmament: a verified census of all weapons, annual 10% reductions, conversion of military budgets into a worldwide Peace Dividend, and the creation of neutral institutions to keep the "nuclear garage" permanently closed. Written for ordinary readers rather than diplomats, the book translates dense treaties into clear steps, answers the skeptic's toughest questions, and closes with a two countdowns from Year 12 to Year 0: one with weapons, one without. ZERO is a field guide for anyone who wants to move from arguing about peace to actually building it.