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.

An escalating race to find the 39 Clues finds Amy and Dan pursuing a Clue guarded by thousands of the world's best-trained soldiers, an effort that separates them in explosively dangerous ways.

A guide to the characters and situations in "The 39 Clues" outlines the Cahills' secrets, including hidden facts, strategies, agents, lost founders, secret bases, and scandals, as well as information about all branches of the family.

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.

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.

Twelve-year-old twins Nick and Eryn investigate why their mother and new stepfather are keeping secrets, why they are forbidden to meet their stepsiblings, and, most important, why their lives are in danger.

Caring for Ivy's talking parrot while she is on vacation, Julie rapidly discovers that an old friend has been hiding secrets that might be causing strange occurrences at Ivy's house, in a tale inspired by the wild parrots of Telegraph Hill and the vegetarianism movement of the 1970s.

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...

After their father's research experiment at the British Museum unleashes the Egyptian god Set, Carter and Sadie Kane embark on a dangerous journey across the globe--a quest which brings them ever closer to the truth about their family, and their links to a secret order that has existed since the time of the pharaohs.

The Greystone kids thought they knew. Chess has always been the protector over his younger siblings, Emma loves math, and Finn does what Finn does best--acting silly and being adored. They've been a happy family, just the three of them and their mom.But everything changes when reports of three kidnapped children reach the Greystone kids, and they're shocked by the startling similarities between themselves and these complete strangers. The other kids...