Spoiler Warning, or about using reverse order.

I got to start at the end with Remember When. I'll claim a combination of Muse influence and a personal love of the foreshadowed effect the story as-told will cause.

Stories like Memento (Nolan 2000 film) and the same-source Memento Mori (J. Nolan 2001 Short Story), the 1995 film The Usual Suspects... they use versions of this same device to great effect. Differences in methodologies in all of those, but they are great examples of how it is done.

How much can you tell in an End-At-The-Beginning and not spoil?

Answer: in fact, you can tell anything you want to. You are simply obliging yourself as a writer to then justify or reference the pathways that lead to those ramifications of the ending. Worst case, you just wrote the whole book in Chapter One (300 pages) and have a hell of a motivation to write a Prequel.

Remember When also uses the following structural devices, although I will strongly assert that I only recognized I was using these in Edit / Post-analysis. The original writing was a flow, after all. Here they are:

End at the Beginning.
Two path parallel, same Main Character, different times / places.
One real Flashback to years before.
A fairly classic Arc Convergence.
An Epilogue rather than extended Denouement.

I have had a couple of discussions with other writers about this all. Their feedback varied as follows:

Yeah, it's great.
Twisty, hard to follow.
Are you @!#$% kidding, trying something this stupid?
You better do it right.
and
It's not a literary style that is accepted.

Other than the last, I accept those all as appropriate.

Post Comments if you have specific questions or remarks, and I'll reply!