John Sweeney is a writer and journalist who has challenged dictators, despots, cult leaders, con artists and crooked businessmen for almost half a century. As a reporter, first for the Observer and then for the BBC, he has covered wars in around 100 countries and has been undercover in the danger zones of Chechnya, North Korea and Zimbabwe. The author of 16 books, including the Sunday Times bestseller Killer in the Kremlin, he has challenged both Donald Trump and Vladamir Putin face-to-face.