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.

William Sandberg, once a well-respected military cryptologist pursuing cutting-edge research, is a ruined man. His career is in shambles, his marriage is over, and he's succumbed to a dark depression. But William's talents haven't gone unnoticed. A nameless, top-secret organization abducts him and tasks him with a daunting mission: decode a message that will reveal the disastrous prophecies hidden in our DNA before it is too late.

Akiko, Mae, and Josie, also called the Infinity Trinity, spring into action after learning that a spy is betraying secrets to the Japanese military--and that Akiko's mother may be involved.--

"A cruise ship loses power in the North Atlantic. A satellite launches in the South Pacific. Professor Malcolm Clare--celebrated aviator, entrepreneur, and aerospace engineer--disappears from Stanford University and wakes up aboard an unknown jet, minutes before the aircraft plunges into the high seas. An extortionist code-named 'Viking' has seized control of a private warfare technology, pitting a U.S. defense corporation against terrorist conspirators...

A former National Security Agency programmer threatens to release a mathematical formula that will allow organized crime and terrorism to skyrocket, unless the code-breaking computer that is used to keep them in check--but that violates civil rights--is not exposed to the public.

Eleven-year-old Fish, seeking a way to help his family financially, becomes a reluctant cabin boy on a pirate ship, where he soon makes friends--and enemies--and is asked to help decipher clues that might lead to a legendary treasure.

'Cruz Coronado grapples with an important secret as the gang heads to China in search of the second-to-last piece of the cipher. Under the watchful eye of a new adviser, life on the ship returns to almost normal ... Almost. Just as things seem to be going smoothly, a familiar face shocks Cruz back into reality, and the final piece in this life-and-death scavenger hunt veers toward a dead end.' --

Twelve-year-old William Wenton is a puzzle-solving genius. He lives with his family in a quiet Norwegian town. They used to live in England, but eight years ago his family suddenly packed up, moved away, and even changed their last name! Neither of his parents will offer an explanation or tell William why he has to keep his talent for solving codes and puzzles a secret.

"Could the Mark Twain books hidden through Book Scavenger contain clues about the string of recent arson fires plaguing the city? And will Emily and James uncover the mystery before the arsonist comes after them?"--

After a mountainside massacre yields a grim message, Painter Crowe, director of Sigma Force, must join with Commander Grayson Pierce and an unlikely ally if he is going to get to the root of a conspiracy that stretches back to a lost prehistoric colony in America.