Liar & Spy — Rebecca Stead

When seventh grader Georges (the S is silent) moves into a Brooklyn apartment building, he meets Safer, a twelve-year-old coffee-drinking loner and self-appointed spy. Georges is happy to hang out with Safer's warm, eccentric family, because lately things haven't been so easy at home: his dad lost his job, and his mom has started working extra shifts at the hospital. Life is no better at school, where Georges is the new target of Dallas, who is always on the lookout for other kids' weak spots (so he knows exactly where to hit them).

Georges becomes Safer's first spy recruit. His assignment? Tracking the mysterious Mr. X, who lives in the apartment upstairs. But as Safer becomes more demanding, Georges starts to wonder: how far is too far to go for your only friend?

Liar & Spy is an inspired, often-funny story about destiny, goofy brilliance, and courage. Like Stead's Newbery Medal-winning When You Reach Me, it will keep readers guessing until the end.