My Pleasure Reading. The thorn Birds. pp. 723 -

The last chapter called "Justine" with the shocked Rainer, who came to Drogheda to talk about Meggie about Justine and her future. In spite the fact that the relationships between them were only friendly, he cared about her future, which was very questionable. Justine blamed herself on Dan's death, thus broke off any relationships with her family. About two years later, Rainer came to London to visit Justine, hiding his amorous feelings to her, where she announced she would return to Drogheda to expiate her sin (Dan's death) for her mother. However, just before her departure, she received the letter from Meggie who convinced her not to return there forever, because it was not her place at all. She would destroy her live by doing it. Justine, realizing all her faults to Rainer, came to him and made a declaration of love. Soon they got married. The book ends with the reference to the book's title which tells us about the mystical birds who searches for the perfect thorn and then implies itself, singing the most beautiful song in her life.