On the 7th of July 2017, 122 countries voted in favor of the Treaty on the Prohibition of Nuclear Weapons. Countries that don't have nuclear weapons but live under their threat voted for a ban. Without the knowledge of most of their citizens, the governments of the world's nuclear powers didn't vote, and yet the ban went ahead. Something new is happening. This documentary film about efforts to bring a nuclear weapon ban treaty into international law and the role of the International Campaign to Abolish Nuclear Weapons, ICAN, is told through the voices of leading activists from several different organizations and countries and the president of the negotiating conference.