Book excerpt: Solve...or get burned! These 45 brilliantly executed puzzles are for solvers who like their crosswords tough, with devilishly difficult clues. It's just right for fans of the Friday and Saturday offerings from places like the New York Times. Each puzzle has a wickedly tricky theme; in fact, there are even explanations in the back for the hardest clues! So if you can't stand the heat...get out while you can!