The whole story broke when I was in Mexico. As we all know by now, I’m an insomniac, so when I woke up at two or so in the morning in a room not unlike the one my character Lili in Palace of the Blue Butterfly would also wake up in, I grabbed my I Pad and clicked on the New York Times. Well, not first thing. First, I lay there listening to the sounds of the city around me, feeling the winter cold in the high-ceilinged 19th century building. After I was pretty sure I’d gotten the setting right in my book, after I’d sort of . . .