Turtle the SeaWing dragon has long dreamed of being a hero, but when the companioinadvertentlytly free Darkstalker, the oldest and most powerful dragon, from the spell that has trapped him, the best he can come up with is a spell that prevents the ancient dragon from seeing him or hearing his thoughts--Darkstalker claims he has changed, but Turtle suspects that he still plans to control dragonkind.

Fourteen-year-old Amy Cahill and her younger brother Dan thought they could return to their regular lives when they found the 39 clues. But the Vespers, powerful enemies, will stop at nothing to get the clues. And with the Vespers rising, the world is in jeopardy.

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,...