One False Note (The 39 Clues #2)
Author: Gordon Korman
Desc: From the back cover: The race is on to find 39 Clues that safeguard a great power and fourteen-year-old Amy Cahill and her younger brother Dan are shocked to find themselves in the lead. The search seems to be taking them to Vienna and they hold a coded piece of Mozart's sheet music that's key to finding the next Clue. But tailed by a pack of power-hungry relatives Amy and Dan can't see if they are sailing toward victory - or straight into a deadly trap.