On a cross-country vacation with their parents, twins Coke and Pepsi, soon to be thirteen, fend off strange assassins as they try to come to terms with their being part of a top-secret government organization known as The Genius Files.

With all of the fairy tale characters occupying the same world, Conner and Alex face their biggest challenge to date of restoring order to the human and fairy tale realms.

"The wackiest road trip in history continues as the McDonald twins travel the Southwest dodging nefarious villains and visiting weird but true American landmarks"--

"Pesah has lived with leprosy for years, and the twins have spent most of that time working on a cure. Then Pesah has a vision: The Angel of Death will come for him on Rosh Hashanah, just one month away. So Ziva takes her brother and runs away to find doctors who can cure him. But when they meet and accidentally free a half-demon boy, he suggests paying his debt by leading them to the fabled city of Luz, where no one ever dies--the one place Pesah...

Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist demands, Tandy decides she must clear the family name no matter what.

Assuming her twin's identity, Frey works to destroy her father, but when a rebel uprising strands her in a city that comes under attack, Frey must step out of the shadows to find her missing sister and take action against her tyrant father.

Eleven-year-old Mallory finds a real challenge in babysitting for the troublesome Arnold twins.

"Max and Ruby prepare for a new baby sibling--only to find out they are getting two of them!"--

Garmann makes friends with Johanna, the twin sister of the girl who torments him at school, when they discover that they both love adventures and talking about outer space.

A little mouse named Spinka creates mischief that twin kittens Kit and Kaboodle are blamed for by their parents.