As Zimbabwe celebrated its independence in April 1980 President Nyerere of Tanzania had a piece of advice for Robert Mugabe: ‘You have inherited a jewel. Keep it that way.’ At first, it seemed that Mugabe would take his fellow socialist’s advice. His address to the nation on the eve of independence gave all Zimbabweans hope that, white and black, they could together rebuild the country after the miseries of the guerrilla war.