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.

Told from separate viewpoints, Chess, Emma, and Finn Greystone, ages twelve, ten, and eight, investigate why their mother went missing and uncover their ties to an alternate world.

A devastated teenaged girl sets out on a quest to track down transplant recipients after she discovers that her older brother was an organ donor.

Every seven years, an important thing, like scent, disappears from the town of Sterling and Aila, sixteen, is determined to find the cause and how her recently-deceased mother was involved.

Fifth-grader Cora feels her life is like the garbage her scientist-parents track, as their marriage is ending and Cora's best friend, Sybella, has thrown her away for a new girl.

Three teenagers, biological siblings separated by adoption, explore the meaning of family in all its forms -- how to find it, how to keep it, and how to love it.

When Judy Moody gets serious about protecting the environment, her little brother Stink thinks she is overdoing it, but she manages to inspire her third grade class to undertake an award-winning, environment-saving project.

Magically transported to southwest China to find the final object needed to break the spell on the wizard Merlin's beloved penguin, Jack and Annie take a side trip to the world's largest giant panda reserve.

While working at pleasant but mundane summer jobs in San Francisco, fifteen-year-old twins, Sophie and Josh, suddenly find themselves caught up in the deadly, centuries-old struggle between rival alchemists, Nicholas Flamel and John Dee, over the possession of an ancient and powerful book holding the secret formulas for alchemy and everlasting life.

"When an animal rights action at a research lab goes wrong, a terrible secret is exposed, and Shay must find her brother Odin before the researchers at Singular Corp can silence both of them"--Provided by publisher.