In September 2013 Tony Collins took advantage of a long-overdue sabbatical to walk the 490 miles of the Camino, from the French border to Santiago de Compostela in northern Spain. For decades he had helped to provide the evangelical churches of the world with reading material. Now he was deliberately stepping out of his comfort zone: a pilgrimage, carrying his pack, through a land whose language he did not speak, into a religious culture far removed...