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.

Australian fourteen-year-old Laura Horton has always been an outsider, more interested in writing, drawing, or spending time with her free-spirited family than in her fellow teens, but she is drawn to Leon, a new student, as together they explore the mysteries of her eccentric old house.

Ten-year-old Jane Doe, the only student average enough to be excluded from the town of Remarkable's School for the Remarkably Gifted, is joined at her public school by the trouble-making Grimlet twins, who lead her on a series of adventures involving an out-of-control science fair project, a pirate captain on the run from a mutinous crew, a lonely dentist, and a newly constructed bell tower that endangers Remarkable's most beloved inhabitant--a skittish...

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.

Twelve-year-old twins Nick and Eryn and their robot stepsiblings, Jackson and Ava, try to save humanity from killer robots.

Twelve-year-old Abilene Tucker is the daughter of a drifter who, in the summer of 1936, sends her to stay with an old friend in Manifest, Kansas, where he grew up, and where she hopes to find out some things about his past.

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,...

Twelve-year-old Trevor Firestone loves playing war-based video games and he idolizes his great-grandfather Jacob who came home from World War II a celebrated hero; now ninety-three Jacob wants to retrace his journey in memory and reality and return to the small French village that his unit liberated, and Trevor is going with him--but not everyone in the town want Jacob to come, and Trevor is going to learn an important lesson: real war is not a video...

In 2041 twelve-year-old Dashiell Gibson is a resident of Moon Base Alpha, and at the moment he is faced with a number of problems: coping with the nasty Sjoberg twins, finding out how the commander of the base has managed to disappear from a facility no bigger than a soccer field, and dealing with the alien Zan who communicates with him telepathically from afar--and who is hiding a secret which may threaten the whole Earth.