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As global leaders turn their attention to the 75th anniversary of the United Nations and the 2020 General Assembly, GZERO Media offers a look back at one of the greatest diplomatic mysteries of the 20th century. The UN's second Secretary-General Dag Hammarskjöld's mysterious death in 1961, while on a mission to the Congo, is the subject of a new book by investigative journalist and former New York Times correspondent Ravi Somaiya. It has the twists and turns of a Tom Clancy novel.

In a new interview with GZERO World host Ian Bremmer, conducted on the eve of the 2020 General Assembly, UN Secretary-General António Guterres confronts the challenges of leading a multilateral organization in an increasingly nationalistic world. "I am not naïve," he tells Bremmer. "I know this is going to be a very tough ideological battle."

Watch the episode: UN Secretary-General António Guterres: Why we still need the United Nations