 For me, having a structure format is really helpful. In my previous book, Letters from Cuba, it was all letters. And it didn't seem so daunting somehow that I was writing a letter instead of a chapter, right? And with this book, it was knowing that it was going to be each girl, that each section would be about 40 or 50 pages because it couldn't be that long if I was going to have the four stories. So here are four girls, four places, four time periods. How is this going to work? How am I going to put this together?