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.
The Butterfly Clues
The Butterfly Clues is a Young adult mystery novel written by Kate Ellison and published in February 2012 by Egmont USA. "The Butterfly Clues" tells the story of Penelope "Lo" Marin, an outcast teenage girl who struggles with Obsessive—compulsive disorder (OCD) and has to deal with the constant urge to steal various items, the frequent relocation due to her father's job, and the memory of her brother Oren's death. Throughout the novel, Lo's problems arise as both weaknesses and strengths, which she is forced to deal with as she attempts to solve the murder of a young stripper.