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
Fiske Green-Cahill (AKA the Man in Black or the Man in Gray) (from Attleboro, Massachusetts) is the brother of Grace Cahill. An artist, Fiske was last seen leaving his painting studio before his disappearance forty-six years ago. Today, he is now disguising himself as an unknown assailant termed the "Man in Black" due to his oily-black suit that hides his entire body. He has been spying on the other teams since then. In the ninth book, he is shortly known as the "Man in Gray", only to reveal his true identity to Amy and Dan Cahill later on. In the last book, he tells Amy and Dan about the Vespers, and later on adopts Amy and Dan. He is a Madrigal. His official card is No. 198 for his true identity, No. 203 for his alter ego Man in Black, and No. 208 for his other identity Man in Gray.