One False Note by Gordon Korman
Amy and Dan have found the first clue and survived the beginning of the hunt. Now the hints lead to Vienna, Austria, and Mozart's music, but their relatives are now targeting them more than any other group, and things get even more dangerous. can they keep up?
"Never before has a contest held so much promise - or so much danger."
Visit http://www.the39clues.com/ to learn more and join the hunt.