Washoe County Library System

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....

In the first 39 Clues book, Amy and Dan Cahill discovered that they're part of one of the most powerful families in human history. Passing up the hush money, the siblings set out to uncover the 39 clues which would reveal the source of their family's awesome power. In each subsequent book, the siblings attempt to discover one clue at a time. Here, Amy and Dan endanger themselves greatly in the name of a clue when they align themselves with the infamous...

Ruby Redfort is a genius code-cracker, a daring detective, and a gadget-laden special agent who just happens to be a 13-year-old girl. She and her slick side-kick butler, Hitch, foil crimes and get into loads of scrapes with evil villains, but they're always ice-cool in a crisis.

After crossing five continents and solving some of history's most perplexing mysteries, Amy and Dan Cahill are nearing the end of their adventure. As the final clue promises to reveal the truth about the Cahill family's awesome power, Amy and Dan must successfully complete a challenge that their ancestors have failed for nearly 500 years.

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.

Guardians of the 39 Clues, Dan Cahill and his sister Amy discover that the serum is missing and must race against time to get it back before catastrophe strikes.

In the first 39 Clues book, Amy and Dan Cahill discovered that they're part of one of the most powerful families in human history. Passing up a pile of hush money, the siblings set out to uncover the 39 clues which would reveal the source of their family's awesome power. Here, in the sixth book, the siblings continue to uncover one clue at a time, encountering Cahill family branches and the mysterious Madrigals in the process. Amy and Dan cross the...

When seven members of his family were kidnapped by the Vespers thirteen-year-old Dan Cahill knew he was in for the fight of his life. He knew he was up against an impossibly powerful enemy. And Dan knew the odds were that some of his family members wouldn't make it. But even as Dan steels himself to accept these facts, the unthinkable happens. The Vespers capture a blameless bystander, Dan's best friend Atticus. With an innocent life on the line,...

When the ancient ruins of Atlantis are discovered along the Spanish coast, linguist and archaeologist Thomas Lourds joins a violent competition to be the first of its explorers, an effort marked by a series of puzzles that must be solved in order to gain entry into the lost civilization.

Salem Wiley is a genius cryptanalyst, courted by the world's top security agencies ever since her quantum computing breakthrough. She's also an agoraphobe shackled to a narrow routine since her father's suicide. When her intelligence work unexpectedly exposes a sinister plot to assassinate the country's first viable female presidential candidate, Salem finds herself both target and detective in a modern day witch hunt. Drawn into a labyrinth of messages...