Grantley Caypor is the main traitor in the short story "The Traitor." Caypor is an English man who is married to a German woman. By some twist, he is suspected of working for the German Intelligence Department. Caypor attracted the interest and dislike of R. when he reported to the Germans the identity and location of an English spy. This information given by Caypor caused the young spy to be caught and killed.