I've never been one for outlines. But I think I just started one in it's absolute most basic form. Here it is:
I. Title: "Working Title about a Dream World that has a much Better Title than this Current One"
II. Prologue ("Five Years" and "Coffee Shop" will appear in this section in some form)
III. Book 1 - Betrayal (This will be the present)
IV. Book 2 - How it used to be (This take place in the past, it leads up to Betrayal)
V. Book 3 - Resolution (This is a continuation of Book 1 and will wrap things up, for better or worse).
So why not make Book 2, Book 1, and Book 1 Book 2? Not sure. Maybe the finished product will be in that order. Or some other order. Maybe there's a Book 4. Who knows. But I think it would be best to establish the main conflict right out of the gate and then fill in the rich history of all the characters later.