When Geronimo buys his aunt's farm he discovers that the large oak tree in the yard holds legendary secrets to unlock.

Throughout the hunt for the 39 Clues, Amy and Dan Cahill have uncovered history's greatest mysteries and their family's deadliest secrets. But are they ready to face the truth about the Cahills and the key to their unmatched power? After a whirlwind race that's taken them across five continents, Amy and Dan face the most the difficult challenge yet -- a task no Cahill dared to imagine. When faced with a choice that could change the future of the world,...

Callum Hunt's life has been difficult ever since he was admitted to the Magisterium, since his father suspects him of being evil, and his closest companion is a Chaos-ridden wolf--but when he discovers that his father may be trying to destroy both him and Havoc, he escapes back to the magical world and he and his friends Aaron and Tamara, become involved in the search for the stolen Alkahest, a copper gauntlet with dangerous powers.

When Nikki's death ray blows a hole in her bedroom floor, she and her ferret are sent off to the special Genius Academy where she worries about fitting in, which proves to be the least of her problems when her death ray goes missing.

A generation ago, Constantine Madden came close to achieving what no magician had ever achieved: the ability to bring back the dead. He didn't succeed... but he did find a way to keep himself alive, inside a young child named Callum Hunt. Now Call is one of the most feared and reviled students in the history of the Magisterium, thought to be responsible for a devastating death and an ever-present threat of war. As a result, Call has been imprisoned...

After their father's research experiment at the British Museum unleashes the Egyptian god Set, Carter and Sadie Kane embark on a dangerous journey across the globe--a quest which brings them ever closer to the truth about their family, and their links to a secret order that has existed since the time of the pharaohs.

Thirteen-year-old Skandar Smith has always wanted to be a Unicorn rider, but when the mysterious Weaver steals the most powerful unicorn in the world, Skandar must face sky battles, ancient secrets, and bloodthirsty unicorns in order to save his island.