Book details
One False Note
The 39 Clues, 2008 by Korman Gordon
on Goodreads (53,365)
Description
The book follows the Cahill siblings, Amy and Dan, as they travel to Vienna in search of the second clue in the 39 Clues competition. They face numerous challenges and dangers as they try to outsmart their ruthless relatives and uncover the secrets of their family's past.