This commented itinerary will lead us to the encounter of the Norman writer, through the streets and the old aristocratic mansions of this «city of worshipped ghosts» where he lived part of his adolescence and then came back «to work and live a hidden life there». It is in Valognes that he writes the essentials of his collection of short stories «Les Diaboliques», in Valognes also that he locates several scenes of his famous novel «Le chevalier des Touches».