Book Scavenger by Jennifer Chambliss Bertman

This is a cute, fun to read mystery for middle grade kids.  Emily is 12 years old, and she and her family have just moved to San Fransisco as part of her parent's quest to live in all 50 states.  Although they have moved frequently, for the past few years, Emily and her older brother have been able to play an online game called Book Scavenger where they hide and or find books based on online clues and earn points and positions by doing so.  The author who created the game lives in San Fransisco and the day they move there, he is shot and hides a book, which Emily finds.  She and her new friend,  James, follow the clues, solve ciphers and go on scavenger hunts to find books and clues to the mystery.  The book is also about friendship and how to be a good friend.  I enjoyed the book and I think that middle grade children will enjoy it as well.