39 Clues: One False Note: A Graphic Novel (39 Clues Graphic Novel #2) - Gordon Korman

After barely escaping Paris, Amy and Dan are now in Vienna to discoverthe truth about their famous ancestor, Wolfgang Amadeus Mozart,and the long-buried secrets connected to his overlooked sister,Nannerl. But with their enemies closing in, Amy and Dan mustdecide how much they're willing to risk, and who they're willingto betray.