The Book Scavenger
Emily's parents want to live in all 50 states, a goal that means Emily is always the new kid at school, and always moving on before she can make friends. The only "friend" she has is an online game, Book Scavenger (which is a combination of geocaching and code-cracking/puzzle-solving). So when her family moves to San Francisco, she's delighted that the boy in the upstairs apartment shares her interest in puzzles and codes. When they accidentally stumble on the starting clue of an as-yet-unpublicized game created by the founder of Book Scavenger, they know they've found something special. What they don't realize is that there's someone in the city who won't stop at anything—including murder—to solve the puzzle first.
A mix of ciphers, book name-dropping, and adventure, make this the perfect pick for kids who love a great mystery. We're late in reading this series, and so we're starting book two this week. I've promised not to read it on my own so it might be a few weeks before I type up a review.
The Book Scavenger By Jennifer Chambliss Bertman