Margaret Atwood, Chimamanda Ngozi Adichie, Julian Barnes, Roberto Bolaño, Jeffrey Eugenides, Nadine Gordimer, Nick Hornby, Kazuo Ishiguro, Han Kang, Stephen King, A.L. Kennedy, Doris Lessing, Ben Marcus, Lorrie Moore, Herta Müller, Alice Munro, Gwendoline Riley, Will Self, Zadie Smith, Rebecca Solnit, John Updike, Jeanette Winterson - the voices that define a generation have all appeared in Granta. See what's next.