In the late twentieth century, as the United Nations struggled to come up with a new legal system for the oceans, one woman saw the opportunity to promote radical new ideas of justice and internationalism. Ocean governance expert Elisabeth Mann Borgese (1918–2002) spent decades working with the United Nations Law of the Sea Convention. Throughout this sprawling series of global conferences, she navigated allegiances and enmities, intrigues and setbacks, fighting determinedly to develop a just ocean order. Featuring extensive research and new interviews with Mann Borgese’s colleagues and family, this book explores timeless questions of justice and international collaboration and asks whether the extraordinary drive and vision of a single person can influence the course of international law.