I wrote about And Adam was a Gardener when you asked about prologues and epilogues. The structure of that work goes back and forth. The prologue has the hero, Dawilan, appearing out of nowhere in a forest on relatively present day Earth. The first "book" takes place a few years later, also on Earth, in Northwest Houston. The heroine, Maggie, meets two men, David Llewellyn and Brian "Briny" Devlin. Hopefully, the readers will wonder which of the two men is the alien Dawilan they met in the prologue. The answer is revealed at the end of that first book. Book Two takes the story backwards, to Dawilan's home planet, Volara, and explains his history, and why he came to Earth. The third book takes up where the first left off.
I didn't originally write it that way. It grew from a writing exercise re creating a utopia. Only, as I wrote, the utopia became flawed, and the hero had to leave his home planet, coming to Earth to save it, but was saved by the Earth people instead. It was one of those writings that just takes on a life of its own and writes itself. Afterwards, I felt the story would hold more interest if it started in media res, as they say.
Several chapters are located in the WIP section.
I have always enjoyed the added mystery of a story where the time sequence moves around, foreshadowings included. It isn't always a good thing, but seemed right for that story. Tell us more about yours, Al.