Grace Cahill has died, and her orphaned grandchildren Amy, 14, and Dan, 11, are among the heirs offered a choice: They can accept one million and walk, or they can take the first clue in a worldwide scavenger hunt to find the secret that has made the extended Cahill family the most powerful family in world history. Every other heir is out to get Amy and Dan, Grace's supposed favorites, as they work their way through the puzzles in this first volume of a ten-book "multi-platform" series.
Join Amy and Dan in an adventure around the world. There is a lot going on in this story!
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