A million dollars, or a clue? Police report a break-in at an elite hotel, and the suspects sound suspiciously like Amy and Dan. There's a car and speedboat chase and an angry mob! When there's a clue on the line, anything can happen.

In The Eye of God, a Sigma Force novel, New York Times bestselling author James Rollins delivers an apocalyptic vision of a future predicted by the distant past. In the wilds of Mongolia, a research satellite has crashed, triggering an explosive search for its valuable cargo: a code-black physics project connected to the study of dark energy{u2014}and a shocking image of the eastern seaboard of the United States in utter ruin. At the Vatican, a package...

Four United States presidents have been assassinated-in 1865, 1881, 1901, and 1963-each murder seemingly unrelated and separated by time. But what if those presidents were all killed for the same reason: a clause in the United States Constitution-contained within Article 1, Section 8-that would shock Americans? This question is what faces former Justice Department operative Cotton Malone in his latest adventure. When a bold assassination attempt...

When Iranian-American Kamran Smith learns that his big brother, Darius, has been labelled a terrorist, he sets out to piece together the codes and clues that will save his brother's life and his country from a deadly terrorist attack.

Throughout the hunt for the 39 Clues, Amy and Dan Cahill have uncovered history's greatest mysteries and their family's deadliest secrets. But are they ready to face the truth about the Cahills and the key to their unmatched power? After a whirlwind race that's taken them across five continents, Amy and Dan face the most difficult challenge yet -- a task no Cahill dared to imagine. When faced with a choice that could change the future of the world,...

At only seventeen years old, Ian Kabra is head of the Cahills, the most powerful family in the world. He has presidents on speed dial, generals at his beck and call. Ian knows he's an ideal leader and the only man enough for the job. There's just one small problem: He's already messed up big-time. A Cahill from the past calling himself the Outcast has risen to challenge Ian with an impossible test. The Outcast has re-created four of history's greatest...

It started with a kidnapping. A shadowy organization known only as the Vespers snatched seven members of the Cahill family and demanded a series of bizarre ransoms from around the world. Thirteen-year-old Dan Cahill and his older sister Amy began a global treasure hunt, determined to bring back whatever Vesper One needed, so long as it kept the hostages safe. But when they deliver the last ransom, Amy and Dan discover Vesper One's terrifying endgame....

Sarah and Aidan begin to decipher a mysterious document that refers to the origins of Peter Pan and are suddenly pursued by a being that can take any form and will stop at nothing to get what it wants from them.

Mr. Quisling is definitely up to something mysterious, and Emily and James are on high alert. First, there's the coded note he drops at a book event. Then Emily and James uncover a trail of encrypted messages in books by Mark Twain hidden through Book Scavenger. What is most suspicious is that each hidden book triggers an arson.

When the archaeologist who asked him to decipher a series of vitally important Templar symbols is murdered, historian Caedmon Aisquith embarks on a dangerous international adventure that leads him to mankind's supreme mystery.