When Amy and Dan learn the truth about the Madrigals and Grace Cahill's alternate will, these discoveries lead to the revelation of a secret about their family and a showdown with the man in black who has been following them.

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,...

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.

After discovering that she is not human, twelve-year-old Alice Mayfair is on a mission to find out who and what she is, but she must do it alone because her best friend Millie Maximus, an undersized Bigfoot who lives in the forest near Alice's school in upstate New York, is focused on fulfilling her dream to sing for a nationally televised talent competition.

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.