The murder of Rasputin on the night of 16-17 December 1916 has always seemed extraordinary: first he was poisoned, then shot and finally drowned in a frozen river by Russian aristocrats fearful of his influence on Tsar Nicholas II and Tsarina Alexandra. Or was he? Dramatic new evidence from previously unpublished documents, diaries, forensic reports and intelligence records now means the plot takes a remarkable twist. Grigori Rasputin is probably...