On the evening of June 23, 2016, Prime Minister David Cameron and his inner circle gathered at 10 Downing Street to witness a turning point in British history. Nearly 52% of the people of the U.K. voted to leave the European Union, a decision that effectively ended Cameron's political career and left the world wondering what happens next. This is the inside account of Brexit, from the British conservatives demanding a referendum to the team of European presidents and prime ministers scrambling to prevent the E.U. from being torn apart.