Cry Journal

The first and obvious reason why authors but books in their story is because they want to tell you it gonna be form a different perspective now. Another reason I think they do it is they want to tell another piece of the story with out combining it into one. When you make it a book it becomes a lot clearer and seems like a separate idea, so you don't think about them together. And at the end you can take both clear ideas and put them together for the ending of your story.