In a future world where teenagers are taken, imprisoned, and forced to fight for their survival, well-behaved Cassie will do whatever it takes to save her rebellious twin sister from Death Row.

Georgia Khatchadorian plans to excel at Hills Village Middle School in all the places her troublemaking brother failed.

When a set of priceless paintings by Leonardo da Vinci and Rembrandt go missing in Russia, the Kidd siblings head to St. Petersburg and the wild Arctic tundra to find the bad guys and locate the treasure.

When their ship, the Lost, explodes, Bick, Beck, Tommy, and Storm are stranded on a raft in the middle of the Mediterranean Sea, but the situation worsens when the treasure hunters kidnap their parents, forcing the Kidd siblings to follow clues around the globe to uncover an ancient treasure and save their family.

When they uncover a conspiracy against America and its fundamental freedoms, the Kidd children, accompanied by their great uncle, crisscross the country in a race to prove that a newly-discovered copy of the Bill of Rights is a forgery.

Twins Bick and Beck Kidd and their family of professional treasure hunters race against mercenaries, rival treasure hunters, and a lumber baron through the jungles and mountains of Peru in search of Paititi, the legendary lost Inca city of gold, in hope of conserving the archaeological treasure and preventing deforestation of the rain forest.

"There's a killer on the road, and nobody is safe. Michael and Megan Fitzgerald are siblings who share a terrifying past. Both adopted, and now grown - Michael is a long-haul truck driver, Megan a college student majoring in psychology - they trust each other before anyone else. They've had to. Their parents are public intellectuals, an Ivy League clinical psychologist and a renowned psychiatrist, and they brought up their adopted children in a rarefied,...