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,...

"As humans and godspawn reel in the aftermath of the citadel's near fall, a new foe shatters their fragile hopes, and the mysteries of the Mesarthim are resurrected"--

A million dollars, or a clue? Police report a break-in at an elite hotel, and the suspects sound suspiciously like Amy and Dan. There's a car and speedboat chase and an angry mob! When there's a clue on the line, anything can happen.

"Recently orphaned Jane accepts an unexpected invitation from an old acquaintance to an island mansion where she will face five choices that could ultimately determine the course of her newly untethered life"--

"When the Alden children see odd lights coming from a closed amusement park and they receive a phone call warning them to stay away, they are determined to figure out what is going on at the park"--

When twelve-year-old Elise, orphaned since age three, becomes disheartened by middle school, with its bullies, changing relationships, and higher expectations, keys to long-locked rooms and messages from her late father help her cope.

Amy and Dan, wanted by the Indonesian police and stranded on an island with a tropical storm on the way, are about to discover a terrible truth about their branch of the Cahill family.

A clue takes Amy and Dan Cahill to Egypt, where they investigate the origins of the rivalry between the Tomas and Ekaterina branches of their family and try to figure out if they can trust a message from their dead grandmother Grace.

Fifteen-year-old Miss Penelope Lumley, a recent graduate of the Swanburne Academy for Poor Bright Females, is hired as governess to three young children who have been raised by wolves and must teach them to behave in a civilized manner quickly, in preparation for a Christmas ball.

Orphans Amy and Dan Cahill, continuing their worldwide quest to track down the thirty-nine clues that will reveal the secret of the Cahill family's power, follow a link to one of the planet's strongest fighters, and have a run-in with the unreliable Alistair.