Five years ago, China's most charismatic politician, Bo Xilai, was toppled from power. His disgrace allowed his great rival, Xi Jinping, to dominate the political stage in a way unseen in China since the days of Chairman Mao.

All this was made possible - writes BBC China editor Carrie Gracie - by the murder of a British business fixer, Neil Heywood, in the Lucky Holiday Hotel.

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