30 April 1924. At the Court of the King's Bench in London, the highest court in the Empire, an English judge and jury heard the case that would change the course of India's history: Sir Michael O'Dwyer, the former Lieutenant Governor of the Punjab – and architect of the infamous Jallianwala Bagh massacre – had filed a defamation case against Sir Chettur Sankaran Nair for having published a book in which he referred to the atrocities committed by the Raj in Punjab. The widely-reported trial – one of the longest in history – stunned a world that finally recognized some of the horrors being committed by the British in India. Through reports of court proceedings along with a nuanced portrait of a complicated nationalist who believed in his principles above all else, The Case That Shook the Empire reveals, for the very first time, the real details of the fateful case that marked the defining moment in India's struggle for Independence.