Cahills vs. Vespers is the second series of The 39 Clues that follows The Clue Hunt. There are six books in the series. Books One, Two, Three, and Five are written by authors who wrote books in the original series.
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 they were wrong. A powerful new enemy, the Vespers, have emerged from the shadows, plunging Dan and Amy on a dangerous journey that will take them from Rome to the ancient city of Timbuktu. If Dan and Amy don't stop the Vespers in time... the whole world will pay.
This is a 39 Clues website video about the Series Two missions.
Book One: The Medusa Plot
After the mysterious Vespers kidnap Cahills around the globe, they order Amy and Dan to steal a priceless painting in exchange for the hostages. The siblings rush to Italy to execute a heist that rivals the most famous art thefts in history. There's just one problem—the painting they steal is a fake. With the clock ticking, Amy and Dan have to track down the real painting before one of Cahill hostages pays the ultimate price.
Book Two: A King's Ransom
When seven members of Amy and Dan Cahill’s family are kidnapped by a sinister organization known as the Vespers, they vow to 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 that no one has seen 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.
Book Three: The Dead of Night
The Vespers have crossed a line. Amy and Dan were devastated when the Vespers kidnapped seven Cahills around the world, holding them hostage until Amy and Dan delivers an impossible ransom. But at least the hostages were Cahills—members of the world's most powerful family, trained to face disaster.
But now the Vespers have kidnapped Atticus Rosenbloom, an innocent 11-year-old boy and Dan's only friend. Dan and Amy find themselves in the struggle of their lives. Because if they can't outwit the Vespers, the unthinkable will happen.
Book Four: Shatterproof
Thirteen-year-old Dan Cahill and his older sister, Amy, have committed a string of thefts that lands them on Interpol's Most Wanted list. But the crimes are not Amy and Dan's fault. A shadowy organization known as the Vespers has kidnapped seven members of the Cahill family. If Amy and Dan don't deliver a series of bizarre ransoms, it's lights out for the hostages.
Until now, Amy and Dan have stayed one step ahead of the police and managed to keep their family safe. But all that's about to change. Vesper One commands them to steal the Golden Jubilee, one of the the worlds' largest diamonds. What Amy and Dan don't know is that the Jubilee is a setup...and someone is going to die.
Book Five: Trust No One
For the first time since leaving Attleboro, the fight against the Vespers has brought Amy and Dan back to the U.S., but their homecoming is anything but sweet.
The siblings thought nothing could hurt more than having their loved ones kidnapped by a cruel and powerful enemy, but the Vespers have landed their most serious blow yet — a blow that strikes at the very heart of the Cahill family.
There's a Vesper mole in their inner circle.
Amy and Dan need to smoke out the traitor before the next hostage dies. But even if they do uncover the mole, the danger won't stop there. Vesper One's next assignment will take the Cahills somewhere crawling with dangerous enemies. They have just days to complete their next assignment and discover who has their back . . . and who wants to stick a knife into it.
Book Six: Day of Doom
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.
The Cahills were history's most powerful family . . . until they met the Vespers. Now the fight is on and the world hangs in the balance. The 16 explosive evidence cards in this card pack unlock a globe- trotting online mission. Follow the ancient trail of explorer Marco Polo and the warlord Kublai Khan to stop a Vesper plot - if you dare.
The Cahills' dangerous enemy, the Vespers, have demanded another priceless artifact—a lost treasure connected to the famous explorer Ferdinand Magellan. If the Cahills don't deliver the object, the world will pay the price. The 16 evidence cards in this card pack unlock a secret mission that places you in the center of the action. Uncover the mystery of Magellan by retracing the path of his legendary expedition—the first to circle the globe—by solving puzzles, cracking codes, and organizing an undercover operation. Do you have what it takes to stop the Vespers?