"The hunt for the 39 Clues has turned Amy and Dan from normal kids into seasoned travelers. They've raced across four continents, survived explosions, and escaped crocodiles, angry ninjas, and even angrier monks. So why do they need fake passports? Could they be heading somewhere more dangerous? Or is someone using the passports to send the siblings a top secret message? Solve the puzzle to investigate the question plaguing Clue hunters around the world: Where are Amy and Dan? Then confirm your guess by reading The 39 Clues Book 5: The Black Circle. "