John Geiger will appear at the Edinburgh International Book Festival on Sunday August 15, and will be joined by Scottish writer Gavin Francis on the theme of "True Tales of the Frozen North."  Other writers at the festival include four Nobel laureates and four Booker winners. Here's the event summary: "Fife-born Orkney GP Gavin Francis headed to the Faroes, Iceland, Greenland and Lapland to blend together a story of travel, history and myth for True North, observing how the peoples and lands of…