POn November 10 2017 Pope Francis became the first pontiff in the nuclear era to take a complete stand against nuclear weapons even as a form of deterrence. At a Vatican conference of leaders in the field of disarmament he made it clear that the possession of the bomb itself was immoral. iA World Free from Nuclear Weapons ipresents the popes address and original testimony from Nobel Peace Prize laureates religious leaders diplomats and civil society activists.PPThese luminaries which include the pope and a Hiroshima survivor make the moral case against possessing manufacturing and deploying nuclear arms. Drew Christiansen a member of the Holy See delegation to the 2017 United Nations conference that negotiated the Treaty to Prohibit Nuclear Weapons helps readers to understand this conference in its historical context.PPiA World Free from Nuclear Weaponsi is a critical companion for scholars of modern Catholicism moral theology and peace studies as well as policymakers working on effective disarmament. It shows how the Churchs revised position presents an opportunity for global leaders to connect disarmament to larger movements for peace pointing toward future action.P