The graphic novel adaptation of the mega-bestseller that launched a global phenomenon! Minutes before she died Grace Cahill changed her will, leaving her descendants an impossible decision: "You have a choice - one million dollars or a clue." Grace is the last matriarch of the Cahills, the world's most powerful family. Everyone from Marie Curie to Harry Houdini is related to the Cahills, yet the source of the family power is lost. 39 Clues hidden around the world will reveal the family's secret, but no one has been able to assemble them. Now the clues race is on, and young Amy and Dan must decide what's hunting clues or uncovering what REALLY happened to their parents.

The second installment in the mega-bestselling The 39 Clues series, now in graphic novel form! Amy and Dan made the choice of a lifetime when they gave up a million dollars in favor of a Clue and joined a competition unlike any the world has ever seen. After barely escaping Paris with their lives, now they're in Vienna to discover the truth about their famous ancestor, Wolfgang Amadeus Mozart, and the long-buried secrets connected to his equally talented but overlooked sister, Nannerl. But with their enemies closing in, Amy and Dan must decide how much they're willing to risk to find the clues, and who they're willing to betray in the process...