39 clues to unscramble. One fabulous prize to win. It's a riddle, a book and a game to play. Are YOU up to the challenge? Written by celebrated author Rick Riordan, this interactive challenge takes books to a place they've never been before.

The first book in the #1 bestselling phenomenon sends readers around the world on the hunt for the 39 Clues! Minutes before she died Grace Cahill changed her will, leaving her decendants an impossible decision: "You have a choice - one million dollars or a clue."Grace is the last matriarch of the Cahills, the world's most powerful family. Everyone from Napoleon to Houdini is related to the Cahills, yet the source of the family power is lost. 39 Clues hidden around the world will reveal the family's secret, but no one has been able to assemble them. Now the clues race is on, and young Amy and Dan must decide what's important: hunting clues or uncovering what REALLY happened to their parents.

The 39 Clues is unstoppable! The bestselling series returns with an adventure spanning four explosive books and a website that places readers right in the action. The Cahill family has a secret. For five hundred years, they have guarded the 39 Clues -- thirty-nine ingredients in a serum that transforms whomever takes it into the most powerful person on earth. If the serum got into the wrong hands, the disaster would rock the world. So certain Cahills have always made it their mission to keep the serum safe, buried, locked away. Until now. Thirteen-year-old Dan Cahill and his older sister, Amy, are the latest guardians of the Clues. They think they've done everything right, but a tiny mistake leads to catastrophe. The serum is missing and Dan and Amy have to get it back and stop who stole it . . . before it's game over. For everyone.

Three bestselling novels in one powerpack! Includes Rick Riordan's THE 39 CLUES: THE MAZE OF BONES, James Dashner's INFINITY RING: A MUTINY IN TIME, and Brandon Mull's SPIRIT ANIMALS: WILD BORN! Available together for the first time, three novels that each launched a blockbuster series. This powerpack includes:THE 39 CLUES #1: THE MAZE OF BONES by bestselling author Rick Riordan. Are you ready to save the world?INFINITY RING #1: A MUTINY IN TIME by bestselling author James Dasher. Fix the past. Save the future.SPIRIT ANIMALS #1: WILD BORN by bestselling author Brandon Mull. The legend lives in you.Three unforgettable adventures are waiting for you....

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.

The end is near! Book 9 of the #1 NY Times Bestselling series. The shadow of a man in black has followed fourteen-year-old Amy Cahill and her younger brother, Dan, on their worldwide search for 39 Clues that lead to a great power. Amy and Dan know the man in black has tried to kill them. They know he's a Madrigal, the most secretive and terrifying group hunting for the Clues. Amy and Dan have run hard and fast, but they can't escape the man following them. And now, in the wake of a terrible tragedy, he's ready to step out of the darkness for their final confrontation.

A new threat faces the world of Erdas in this continuation of the New York Times bestselling series. Split between two worlds, Conor, Abeke, Meilin, and Rollan are four young heroes who are racing to stop an ancient evil. Even the spirit animal bond, the sacred link between humans and animals, is on the brink of destruction.The friends face an enemy with the power to enslave others to its will-and to steal spirit animals away from their rightful partners. With their own allies falling to this darkness, the four must look to their bonds to light the way forward. But one of those lights is about to go out. Briggan, Uraza, Jhi, and Essix. Before their journey is over, one of these legends will be lost.