Margaret Peterson Haddix

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,...

In a society that allows families to have only two children, a group of third-borns tries to save themselves and others like them.

New York Times bestselling author Margaret Peterson Haddix takes readers on a thrilling adventure filled with mysteries and plot twists aplenty in this absorbing series about family and friendships. Perfect for fans of A Wrinkle in Time and The City of Ember!

What makes you you?

The Greystone kids thought they knew. Chess has always been the protector over his younger siblings, Emma loves math, and

...

Time travelers Jonah and Katherine arrive in 1611 to rescue missing child John Hudson, son of the 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. Author's note includes facts about Henry Hudson's explorations.

In a future where the law limits a family to only two children, third-born Luke has been in hiding for the entire twelve years of his life, until he enters boarding school under an assumed name and is forced to face his fears.

In the journal she is keeping for English class, sixteen-year-old Tish chronicles the changes in her life when her abusive father abandons her and her brother, and her mother follows him.

When Jonah and Katherine travel to early 1900s Switzerland and Serbia to return Albert Einstein's daughter, Lieserl, to history, her mother Mileva grasps entirely too much about time travel and has no intention of letting her daughter go.

Time-travelers Jonah and Katherine are summoned to help another missing child from history, this time Virginia Dare from the Roanoke Colony, but their journey is sabotaged and goes dangerously awry, leaving them in the wrong time period. Includes author's note about the history of Roanoke Colony and Virginia Dare.

"It isn't natural for you to be younger than your great-grandchildren. We messed around with nature, and we shouldn't have. Melly and Anny Beth both lived normal lives throughout the 20th century. But in 2000, when they are old and ready to die, they are selected to participate in Project Turnabout and are given an injection to make them grow younger..."

In a society that allows families to have only two children, third child Matthias joins the Population Police to infiltrate their system.