'The Border Line' is unusual in that Lawrence dabbles in the supernatural (as he was to do again in 'The Rocking-Horse Winner' two years later) and that this is less a story in the traditional sense and more an exploration of the mind of a particular woman, based on his own wife, Frieda. Katherine, in the story, realises that her real love was her first husband whom she should, according to Lawrence, have submitted to to gain real happiness. As Lawrence says in the story, thinking of his German wife perhaps, 'Beyond all race is the problem of man and woman).