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Are you ready to save the world? The bestselling series returns with an adventure spanning 6 explosive books, 2 secret-filled card packs, and a website that places readers right in the action.Thirteen-year-old Dan Cahill and his older sister, Amy, thought they belonged to the worlds most powerful family. They thought the hunt for 39 Clues leading to the source of that power was over. They even thought theyd won. But Amy and Dan were wrong.One by one, distress calls start coming in from around the globe. Cahills are being kidnapped by a shadowy group known only as the Vespers. Now Amy and Dan have only days to fulfill a bizarre ransom request or their captured friends will start dying. Amy and Dan dont know what the Vespers want or how to stop them. Only one thing is clear.