To mark his 70th birthday Michael Harding travelled to Spain and walked the Camino de Santiago. Yet, as he set off on his pilgrimage, he found he wasn't alone. Accompanying him was the ghost of his long-dead father, a distant and aloof figure whom he lost when he was only twenty-two years old. In his latest work Michael Harding examines how this man, who had died almost half a century ago, could have had such a profound effect on the writer's life.