One belief has sustained fourteen-year-old Amy Cahill and her younger brother, Dan, on their hunt for the 39 clues : they are the good guys. But then a shocking discovery about their parents shatters everything amy and Dan think they know, dividing the two siblings for the first time ever. When Dan disappears in a country of more than a billion people. Amy has to make a terrible choice - find the next clue - or find her younger brother.