One False Note
One False Note is the second book in "The 39 Clues" series. It is written by Gordan Korman, and was published by Scholastic on December 2, 2008. Following the events of "The Maze of Bones", the protagonists Amy and Dan Cahill learn about Mozart and travel to Vienna, Austria to search for the second clue in the 39 Clues competition. "One False Note" entered the Children's Books New York Times Best Seller list at number one on December 21, 2008 and stayed on the list for children's chapter books for 12 weeks.
List of The 39 Clues characters
Robert Cahill Henderson, also known by his alias name Bob Troppo, (from Coober Pedy, Australia) is an infamous scientist. He was one of the Cahills who came close in finding all 39 Clues. Days before his marriage, he managed to steal all Clues from the branch of his fiancėe, and was charged for stealing by the family. His laboratory was also destroyed during the eruption of Krakatoa. He is an Ekat. He has no card.