European empires had not yet reached their zenith when Asian radicals planted the seeds of their destruction. They gained energy and recruits after the Bolshevik Revolution, which sparked visions of a free and radically equal world. Thanks to cheap printing presses and the new possibility of international travel, these Utopian revolutionaries built clandestine webs of resistance from London and Paris to Calcutta, Bombay, Hanoi, and Shanghai. Tim Harper takes us into this shadowy world, following the interconnected lives of Asian Marxists, anarchists, and nationalists such as M. N. Roy, Ho Chi Minh, and Tan Malaka. Underground Asia shows for the first time how the national liberation crucially depended on global action and reveals how these insurgencies shape the region to this day.