What is the author's style in Postcards from No Man's Land by Aidan Chambers?

This novel is told from the point-of-view of two characters: Jacob and Geertrui. Jacob's chapters are told in past tense and third-person narration. This means that the unnamed narrator stays close to Jacob's point-of-view and gives the reader access into Jacob's thoughts and emotions while still referring to him in the third person. Geertrui's chapters are written in past tense, first-person narration taken directly from her personal memoirs.