The adventures of a nine-year-old twin brother and sister who, despite constant bickering, support each other loyally at home and at school.

Second-graders Arlene and Ilene Kelly are twins, identical twins to be exact, and they love being a pair. They love to dress alike, they have identical pet ferrets, and they do everything together. But being a twin is not always easy. And when Arlene gets sick and has to visit the hospital, the twins each find out what it's like to be one instead of two. But whether they're together or apart, Arlene and Ilene know they're lucky to have each other....

Quarter-midget car racer Michael Haynes and his twin brother Mark, the team's mechanic, are used to winning their races, but when a new, unscrupulous racer starts competing, even causing Michael to be injured in a race, the twins are tempted to start using different tactics themselves.

"The Kidd children--including twelve-year-old twins Rebecca and Bickford--follow mysterious clues that take them from China to Germany, in the hopes of finding their missing father and the treasure that will finally free their kidnapped mother"--

Desperate to outmaneuver the evil Alvar Kitsune, Moria allies with Gavril, while Ashyn discovers that she is the key to a ritual that could reawaken an ancient dragon and turn the tide of the coming battle in their favor.

At Camp Whatsitooya, twins Joules and Kevin and new friend Nelson face off against large, rabbit-like creatures from the Mallow Galaxy who thrive on sugar, but are not above hypnotizing and eating human campers.

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.

Everything Aaron has worked so hard to build in Quill has crumbled. Fallen from the height of power and influence and left for dead in a foreign place, Aaron has lost everything, and now he must humbly beg for food from those who saved his life. In Artime, Alex chooses his people over his brother and abandons his search for Aaron, closing the door on that relationship forever. The Artimeans need his focus now more than ever as they face the terrifying...

Opal Koboi, the power-crazed pixie, is plotting to exterminate humankind and become fairy queen. If she succeeds, the spirits of long-dead fairy warriors will rise from the earth, inhabit the nearest available bodies, and wreak mass destruction.

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.