Yang Jisheng's 'Tombstone' is the book that broke the silence on of one of history's most terrible crimes. More people died in Mao's Great Famine than in the entire First World War, yet this story has remained largely untold - until now. Still banned in China, 'Tombstone' draws on the author's privileged access to official and unofficial sources to uncover the full human cost of the tragedy, and create an unprecedented work of historical reckoning.