Henry Carter Hull

Throughout the hunt for the 39 Clues, Amy and Dan have encountered some of the darkest aspects of history... and had to deal with the role their family played. But are they ready for the truth? In this thrilling ninth installment, Amy and Dan hit the high seas as they follow the trail of some infamous ancestors to track down a long lost treasure. However, the real prize isn't hidden in a chest. It's the discovery of the Madrigals' most dangerous secret...

When thirteen-year-olds Jonah and Chip, who are both adopted, learn they were discovered on a plane that appeared out of nowhere, full of babies with no adults on board, they realize that they have uncovered a mystery involving time travel and two opposing forces, each trying to repair the fabric of time.

Teenage detective Nancy Drew uses her courage and powers of deduction to solve the mysterious happenings in an old stone mansion.

Time travelers Jonah and Katherine arrive in 1611 to rescue John Hudson, the missing son of explorer Henry Hudson, but just as the mutiny on the "Discovery" is supposed to start, Jonah and Katherine's knowledge of history is tested once again and they fear that more is at stake than just one boy's life. Includes facts about Henry Hudson's explorations.

Thirteen-year-old Dan Cahill and his sister, Amy, figure out Vesper One's endgame and realize they must stop the organization from using their ransoms to harm millions of people.

"This is a story of stolen violins. It's got mummies, museums, sandwiches, hostages, and a dangerous showdown with the Russian Red Army Choir. Open this book to find out more about my adventures. But beware--this mission is top secret and very dangerous!" -- cover.

The robbery of the treasure in the tower proves to be an exciting challenge to Frank and Joe.

Frank and Joe unravel two mysteries, one involving a counterfeiting case and the other concerned with a national security case their father is working on.