What is the summery of the 39clues one false note?

Amy, Dan, and their au pair, Nellie, follow the second clue to Wolfgang Amadeus Mozart in Vienna, Austria, where they learn about his sister, Nannerl. They go to Wolfgang's house and ask for her diary but find out Jonah Wizard stole it. After stealing it back, Nellie translates it and notices that three pages are missing. They then travel to Venice, where they find a secret passage to the Janus stronghold with the missing pages. The pages say that Nannerl Mozart thought her brother was going crazy because he was getting into debt by buying Japanese steel. A name,Fidelio Racco,which was also found on a paper taken from Alistair Oh,appears in the diary. Amy and Dan go into Fidelio's Racco's mansion, but the Kabras have followed them.In the end, they defeat the Kabras and book a flight to Japan. The Kabras' fate is unknown, and it is possible that they will have to withdraw from the contest like the Starlings.(However, in a sneak peak of The Sword Thief,the Kabras are following Dan and Amy)