Detective 39 Clues Series - Rick Riordan,...

The 39 Clues books feature 14-year-old Amy Cahill and her younger brother Dan on a quest to discover the secret behind their family's power.

The first 10 books follows the Clue Hunt.
The 11th transitions to the spin-off series.
Two companion novels just add depth to the series.

This Series Currently Has 5 Spin Off Series:
*The 39 Clues: Cahills vs. Vespers
*The 39 Clues: Rapid Fire
*The 39 Clues: The Cahill Files
*The 39 Clues: Unstoppable
*The 39 Clues: Doublecross
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Vespers Rising (The 39 Clues #11)
by Rick Riordan, Peter Lerangis, Gordon Korman, Jude Watson​

Published April 5th 2011

The Cahills thought they were the most powerful family the world had ever known. They thought they were the only ones who knew about Gideon Cahill and his Clues. The Cahills were wrong. Powerful enemies - the Vespers - have been waiting in the shadows. Now it's their time to rise and the world will never be the same.

 

The 39 Clues: Cahills vs. Vespers series

The Clue Hunt is Over, but now there's a New Danger to the Cahill Clan, an enemy that was established before the siblings ever split, the Vespers. When they kidnap members of the Cahill family, the clue contestants must band together to find them and get them back.

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The Medusa Plot (The 39 Clues: Cahills vs. Vespers #1)
by Gordon Korman​

Published July 5th 2011

Are you ready to save the world? The bestselling series returns with an adventure spanning 6 explosive books, 2 secret-filled card packs, and a website that places readers right in the action.

Thirteen-year-old Dan Cahill and his older sister, Amy, thought they belonged to the world's most powerful family. They thought the hunt for 39 Clues leading to the source of that power was over. They even thought they'd won. But Amy and Dan were wrong.

One by one, distress calls start coming in from around the globe. Cahills are being kidnapped by a shadowy group known only as the Vespers. Now Amy and Dan have only days to fulfill a bizarre ransom request or their captured friends will start dying. Amy and Dan don't know what the Vespers want or how to stop them. Only one thing is clear. The Vespers are playing to win, and if they get their hands on the Clues . . . the world will be their next hostage.

 

A King's Ransom (The 39 Clues: Cahills vs. Vespers #2)
by Jude Watson​

Published November 1st 2011

Amy and Dan are in a race for their lives . . . and the enemy may be even closer than they think.

When seven members of their family were kidnapped by a sinister organization known as the Vespers, thirteen-year-old Dan Cahill and his older sister, Amy, vowed they'd stop at nothing to bring the hostages home. But then the ransom comes in and the Vespers demand the impossible. Amy and Dan have just days to track down and steal an ancient map. The only catch? No one has seen the map for half a century.

Now Amy and Dan are on a desperate search that will lead them to the Nazis, spies, a mad king and some of history's dirtiest secrets. It's the race of their lives . . . and one misstep will mean certain death for the hostages.

 

The Dead of Night (The 39 Clues: Cahills vs. Vespers #3)
by Peter Lerangis​

Published March 1st 2012

A LIFE ON THE LINE

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, Dan kicks off a frantic hunt that will take him from the back alleys of Prague to the rock caves of Turkey. But Dan better find Atticus fast. If he doesn't, his best friend will surely die.

 

Shatterproof (The 39 Clues: Cahills vs. Vespers #4)
by Roland Smith​

Published September 4th 2012

After pulling some spectacular heists, Amy and Dan have become two of Interpol's most wanted criminals. So when Vesper One orders them to steal the world's largest diamond, they know they're facing life in prison...or worse. But with the Cahill hostages still in peril, Amy and Dan have no choice but to launch a mission that leads them to an ancient city full of dangerous secrets. With a Vesper mole sabotaging the Madrigals from inside, Amy and Dan have to fulfill their enemy's request before it's too late. Vesper One has developed a taste for killing Cahills, and Amy and Dan aren't going to wait to see who's next.

 

Trust No One (The 39 Clues: Cahills vs. Vespers #5)
by Linda Sue Park​

Published December 4th 2012

When seven members of their family were kidnapped, thirteen-year-old Dan Cahill and his older sister, Amy, got ready for the fight of their lives. But their enemy, a terrifying group known as the Vespers, remained frustratingly elusive. They stay in the shadows, picking off Cahills one by one.

And now the Vespers have landed their most serious blow yet - a blow that strikes at the very heart of the Cahill family. Because Amy and Dan discover that there's a Vesper mole in their innermost circle. Amy and Dan need to smoke out the traitor before the next hostage dies. They have just days to discover who has their back . . . and who wants to sink a knife into it.

In this fifth volume to The 39 Clues: Cahills vs. Vespers series. Amy and Dan will venture into an unthinkable adventure that will have anticipating the final volume.

 

Day of Doom (The 39 Clues: Cahills vs. Vespers #6)
by David Baldacci​

Published March 5th 2013

The Ultimate Sacrifice

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. The objects he demanded are vital pieces in a Vesper plot that will harm millions of innocent people. Now the two siblings and their friends are in an all-out sprint to stop Vesper One . . . before the whole world goes BOOM.

In this final volume to The 39 Clues: Cahills vs.Vespers series. Baldacci will have you on the edge of your set to see what will happen.

 

Legacy (The 39 Clues: Rapid Fire #1)
by Clifford Riley​

Published December 25th 2011

The first of seven brand new 39 clues stories, leading up to one explosive reveal.

Time is running out for Grace Cahill as she struggles to make the most important choice of her life: a decision that will shape the future of the Cahill family... and the world at large. After spending centuries lurking in the shadows, the Cahill's enemy-the Vespers- are planning an attack, and sending Amy and Dan on a dangerous hunt for the 39 clues might be the only way to stop them.

 

Ignition (The 39 Clues: Rapid Fire #2)
by Clifford Riley
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Published December 26th 2011