Book excerpt: The answers are fairly common words and phrases--but the clues are diabolically difficult, with mischievous misdirections, trivia, puns, and other trickery. Try this: "change of heart" (15 letters). Answer: "organ transplant." "Finely crafted crosswords that will put your word and trivia skills to a severe test."--Will Shortz, Crossword Editor, "The New York Times."