Flannery O'Connor said: "A story has a beginning, a middle, and an end, though not necessarily in that order."
And that brings us to a look at Postmodernism:
The Questions of Postmodernism
The Los Angeles Times creates a " list of the 61 essential reads of postmodern literature. It's annotated with ... attributes — the author is a character, fiction and reality are blurred, the text includes fictional artifacts, such as letters, lyrics, even whole other books, and so on."
And to end with Flannery O'Connor
"A story is a way to say something that can’t be said any other way, and it takes every word in the story to say what the meaning is."
— Flannery O'Connor
I don't expect that it matters if you begin at the end and work your way backwards.