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The race is on to find 39 Clues that safeguard a great power, and 14-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 the 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.

What would happen if you discovered that your family was one of the most powerful in human history? What if you were told that the source of the family's power was hidden around the world, in the form of 39 Clues? What if you were given a choice - take a million dollars and walk away...or get the first Clue? If you're Amy and Dan Cahill, you take the Clue - and begin a very dangerous race.

Sam, Derek, and Caitlin love solving mysteries, and when they visit Washington, DC, spies are lurking. What starts out as a fun game of pretend on the National Mall turns all too real when they follow a mysterious man to a meeting deep within the Capitol. To keep government secrets from falling into the wrong hands, the kids must work with federal agents and travel to historic Mount Vernon for a state dinner with the president and his son.