In 1936 Mao Tse-Tung, then a cave-dwelling revolutionary, told Edgar Snow his life story. Snow recorded Mao’s self-serving autobiography in Red Star Over China, which for decades made the American’s name as the leading reporter in China.

Back in China twenty-four years later, Snow was pestered by news agencies enquiring about mass starvation. The Snow of the 1930s had gone into the field to see for himself a prolonged drought in the north-west, where people were rumoured to be selling their children. But this time