The Maze of Bones by Rick Riordan
Book One of The 39 Clues series
The 39 Clues series is a unique new mystery that follows siblings Amy and Dan Cahill as they follow clues left by their late Grandmother. After her death, Amy and Dan find out that their extended family is much larger (and more powerful!) than they'd ever imagined!
At the reading of their Grandmother's will, Dan and Amy are given the choice of receiving a million dollars immediately, or uncovering the 39 clues hidden around the world that will lead to "something bigger..." but no one knows what. By taking on the clues, they end up in a dangerous race against their own family members that takes them around the country and eventually, the world.
There will be 10 books in this exciting series, each written by a different author. This mystery is perfect for middle school readers, with enough action and suspense to keep you on your toes! Start the adventure in The Maze of Bones, continue it with One False Note, by Gordon Korman, and keep an eye out for book 3, coming soon!