In this extract from ‘The Writer, The Island and The Inspiration’ in her new book Writing Landscape, Linda Cracknell travels to the tidal island of Erraid in the footsteps of Robert Louis Stevenson and his hero David Balfour from Kidnapped. Before travelling to France in summer 2019, and having now read Kidnapped, I made a mini-pilgrimage to the Isle of Mull’s western peninsula, the ‘Ross of Mull’. And then, to where, at its far western tip, Erraid is connected and separated by the tidal pulse. I’m intrigued by tidal islands; a threshold opening and closing in a rhythm cosmically determined.…