Never turn your back on the Cahills.... The most powerful family history has ever known returns with a vengeance in The 39 Clues: Doublecross! Confidential until August 2015!

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.

Calling all Cahills! Announcing a 39 Clues Superspecial adventure - the gang is back, and called to investigate one of their own: Sinead Starling.

Amy and Dan find themselves in a new global race but this time, everything’s different. Those closest to them might be working for the enemy, and Amy and Dan are forced to ask themselves how far they’re willing to go to save the kidnapped Cahills. How much can you risk when there’s no one to trust?

What would happen if you discovered that your family was one of the most powerful in human history? What if you were told that the source of the family's power was hidden around the world, in the form of 39 Clues? What if you were given a choice - take a million dollars and walk away...or get the first Clue? If you're Amy and Dan Cahill, you take the Clue - and begin a very dangerous race.

Ana Dakkar is a freshman at Harding-Pencroft Academy, a five-year high school that graduates the best marine scientists, naval warriors, navigators and underwater explorers in the world. Ana's parents died while on a scientific expedition two years ago, and the only family's she's got left is her older brother, Dev, also a student at HP. Ana's freshman year culminates with the class' weekend trial at sea, the details of which have been kept secret. She only hopes she has what it'll take to succeed. 

Penguin presents the unabridged, downloadable audiobook edition of The Hidden Oracle: The Trials of Apollo, Book One, by Rick Riordan, read by Robbie Daymond. How do you punish an immortal? By making him human. After angering his father, Zeus, the god Apollo is cast down from Olympus. Weak and disorientated, he lands in New York City as a regular teenage boy.

Thor's hammer is missing again. The thunder god has a disturbing habit of misplacing his weapon - the mightiest force in the Nine Worlds. But this time the hammer isn't just lost; it has fallen into enemy hands. If Magnus Chase and his friends can't retrieve the hammer quickly, the mortal worlds will be defenseless against an onslaught of giants. Ragnarok will begin.

Carter and Sadie Kane's dad is a brilliant Egyptologist with a secret plan that goes horribly wrong. An explosion shatters the ancient Rosetta stone and unleashes Set, the evil god of chaos. Set imprisons Dr Kane in a golden coffin and Carter and Sadie must run for their lives. To save their dad, they embark on a terrifying quest from Cairo to Paris to the American Southwest and discover the truth about their family’s connection to the House of Life: an Egyptian temple of magic that has existed for thousands of years.

Mysterious incidents are wreaking havoc throughout Camp Jupiter. And if the Romans don't find out who - or what - is behind the episodes soon, the Twelfth Legion could implode. Suspicion falls on Claudia, the Fourth Cohort's newest probatio. To find out the truth, see through Claudia's eyes the crime scenes and watch as the bizarre events unfold - even when she discovers a secret that holds the key to Camp Jupiter's safety.... 

Titans have powers that even Zeus, Lord of the Olympians, is scared of. And apparently, I’m a Titan. When I finally meet my mom for the first time ever, she tells me that I’m descended from the almighty Oceanus, drags me under the sea, and dumps me at Olympus Academy to learn to use my powers. And boy, did she forget to tell me a few things!

Molly Pepper, daughter of brilliant but unknown inventor Cassandra Pepper, lives with her mother in New York. By day, they make ends meet running a pickle shop; but by night, they toil and dream of Cassandra taking her place among the most famous inventors in America. In an attempt to find a way to exhibit Cass’s work at the World’s Fair, they break into the Inventor's Guild, where they discover a mysterious plot to destroy New York.

Mira is a mermaid on a mission. It’s time to leave the ocean. Mira Belshaw has been at sea for...well, she doesn’t know how many years. It’s hard to keep track of time when you live in the ocean. But after enough time, the salt water triggers the desire to procreate, and her time is up. Finding a mate is the most important thing to her right now, and to do that, she has to return to the place where she was last human - the coastal city of Saltford.

In the near future, barrier domes shield Earth's wealthiest cities from catastrophic solar flares, but only the healthy elite are granted protection. Those who are unable to prove their ability to work are sent to live in the sanctuaries - camps outside the barrier domes where residents have little to no protection from flares. It’s brutal living there.

Talia Inger is a rookie CIA case officer assigned not to the Moscow desk as she had hoped but to the forgotten backwaters of Eastern Europe - a department only known as "Other". When she is tasked with helping a young, charming Moldovan executive secure his designs for a revolutionary defense technology, she figures she'll be back in DC within a few days. But that's before she knows where the designs are stored - and who's after them.