Grid was very challenging and needed the check function. Then, once I took another look at the title and realized that there should be two cities intermixed in each theme answer, everything quickly fell into place. And when I googled the answer for confirmation, I found that indeed the answer as I anticipated was one of the two cities in the referenced book. I guess I'll learn the name of the other city if I read the book. (No, didn't google the book title.)
Worth the effort. Very well plotted out.