Alois Derso (1888-1964) and Emery Kelen (1896-1978) became internationally renowned for their cartoon depictions of efforts to build a better world following the establishment of the League of Nations; of the rise of fascism; and of international cooperation through the United Nations. Their sequence of cartoons, imbued with humour, wit, gentle satire, artistry and vision, captures the Zeitgeist of a period of history that resonates today. Surprisingly, no comprehensive account of their work and lives has been published before. Drawing on original research, this overdue book delves into all aspects of Derso and Kelen's careers, analysing and discussing the extraordinary political insights revealed in their cartoons. So memorable and informative are the images, it is also a useful supplement to the literature on modern history, international relations and art.