Naomi Klein’s new book, Doppelganger, is personal. For years the author of No Logo, The Shock Doctrine and This Changes Everything, a vital critic, has been confused with the “Other Naomi”. The first time it happened Klein was “in a stall in a public bathroom just off Wall Street”, she recounts at the start of Doppelganger. It was November 2011, at the height of Occupy Wall Street, and the organisers of the movement’s original Manhattan encampment had called for a march through New York’s financial heart that day. “I was about to open the door when I heard two women...