Book excerpt: Friday crosswords are known to be the most arduous of the week. You’ve made it through four days and by now your brain is a finely tuned machine. Rev up your brain cells on super tough puzzle that are fuel for thought. A little more than half of the 72 crosswords have themes—“Chapter and Verse,” “Radical Chic,” “Dress Code,” “Family Ties,” etc.—and often there’s something tricky going on. Once you’ve figured out the final clue in the last puzzle, take a break over the weekend and then start all over again withEasy Monday Crosswords #2.