Kerri's book Pick of the Week is "Code Name Verity" by Elizabeth Wein.
"Code Name Verity," by Elizabeth Wein, is a fiendishly plotted mind game of a novel, the kind you have to read twice. The first time you just devour the story of girl-pilot-and-girl-spy friendship and the thrill of flying a plane and the horrors of Nazi torture and the bravery of French Resistance fighters and you force yourself to slow down, but you don't want to, because you're terrified these beautiful, vibrant characters are doomed. The second time, you read more slowly, proving to yourself that yes, the clues were there all along for you to solve the giant puzzle you weren't even aware was constructed around you, and it takes focus and attention to catch all the little references to the fact that nothing is what you thought. Especially while you're bawling your eyes out.