In my research for how to write good stories, I came across a wonderful channel called "Lessons from the Screenplay." While I am no writing a screenplay, I still find the creator's words extremely relevant to what I'm doing.
In this instance, he comparing two stories and how the ends inform the beginnings. It's really good, and it's something I'm trying to work with myself. It isn't easy to write this way, especially in a book series like I'm doing. But thinking ahead, setting up the end in the beginning, are really important skills all writers should have.