John McCain's 24-year-old daughter Meghan has a book deal! Sources say Hyperion has prevailed over at least three other publishers in an auction that began earlier this week, following a round of meetings during which the in-your-face young conservative and the literary agent she shares with her father, Sterling Lord Literistic president Flip Brophy, discussed a number of possible approaches to the book with editors around town. Several sources said the advance Ms. McCain will receive from Hyperion, which is owned by the Disney Company, is in the high six figures.