|One False Note|
|Publication Date:||December 3, 2008|
|Preceded By:||The Maze of Bones|
|Followed By:||The Sword Thief|
"Never before has a contest held so much promise-or so much danger."Page. 4
"THE HUNT IS ON
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. How much will it take for Amy and Dan to become the young heroes and gain their family's secret power"
Amy, Dan, and their au pair, Nellie, found music by Wolfgang Amadeus Mozart in the end of The Maze of Bones, so they go to Vienna, Austria, to learn more about him. On the train, Holts attack them to steal the music, but they fail when Saladin eats the sheet of music from Paris. Dan has great memory and he rewrites the song music on a train napkin.
In Vienna, Amy and Dan discover that Mozart had a younger sister: Maria Anna "Nannerl" Mozart. They go to a library and ask for her diary but find out that Jonah Wizard stole it. They steal it from him, then Nellie translates it and notices that three pages are missing.
Then, Amy and Dan discovers that there is another song in the middle of the song by Mozart. That song's name is "The Place Where I Born", so they go to the place where Mozart was born: Salzburg, Austria. There, they see Alistair Oh, and follow him. He goes into the Salzburg Catacombs, and they follow him in. There, Amy and Dan see The Man in Black, and there is an explosion, but they barely escape.
Later, Nellie discovers a homing device on the collar of their cat, Saladin. They place it on Alistair Oh's cane when he is sleeping. They also steal a document from him. It mentions Venice, Italy, so they go there.
In Venice, they follow Jonah Wizard, and find a secret passage in a music store called Disco Volante to a Janus stronghold. There, they find the missing diary pages, and steal them. 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 the paper taken from Alistair Oh, appears in the diary. Because of that, Amy and Dan go into Fidelio's Racco's mansion (which is now a museum). There they see the Kabras, who attack them, but Ian falls into the booby trapped key, and is knocked unconscious while Dan throws a tranquilizer dart at Natalie knocking her out.
Then, in the same place, Amy and Dan find the second Clue, tungsten, and two Japanese swords. Because of that, Amy, Dan, and Nellie buy plane tickets to Tokyo, Japan.
The book ends with Alistair Oh finding out who is owner of the tracking device that was placed on Saladin and himself. That person is Grace's lawyer and friend, William McIntyre.
In the audiobook, there is an audio extra bout one of Grace Cahill's hearings.
- Irina Spasky
- Alistair Oh
- Jonah Wizard
- Broderick Wizard
- Ian Kabra
- Natalie Kabra
- Nellie Gomez
- Amy Cahill
- Dan Cahill
- Hamilton Holt
- Reagan Holt
- Eisenhower Holt
- Mary-Todd Holt
- Madison Holt
- William McIntyre
- Fiske Cahill (The Man in Black)
Tungsten (a.k.a. Wolfram).
On the inside front cover, the middle shard has a piece of a music sheet. Excluding only the treble cleff, the note names, along with the letters, spell "Gideon".
Also, on pages 83–95, each letter is placed one backward in the alphabet. When decoded, the message reads "Look to India."
To: Agents with Top Secret Security Clearance
Re: The Cahill Family
ATTENTION: Our spies across the globe report new activity in the Cahill family. Rumors are coming thick and fast. But the best intelligence we have suggests the Grace Cahill (internal codename: Wildcat) has launched a hunt for some sort of "Clues" hidden around the world. Cahills who find "Clues" are eligible to win $100,000 in prizes.
OUR MISSION: To try to infiltrate the notorious Cahill family and find the hidden "Clues" - whatever they may be.
OUR METHOD: To impersonate actual Cahill family members.
Good luck. You're going to need it.
P.S. Make sure Klose doesn't see this!
Not noticed by most, the cover of each of the first three books are designed to foreshadow the next book: on the first book, you see shards of the glass that is on the front of the second book; the second book shows skulls on the left, the glass in the center, and a sword in the right; and in the third book, it shows glass at the left and nothing on the right. By the fourth book, the pattern was dropped in favor of more appealing covers.
Also, one of the glass shards has Maria Anna "Nannerl" Mozart's face on them.