Iselia "Seelie" Graygrove looks just like her twin, Isolde...but as an autistic changeling left in the human world by the fae as an infant, she has always known she is different. Seelie's unpredictable magic makes it hard for her to fit in--and draws her and Isolde into the hunt for a fabled treasure. In a heist gone wrong, the sisters make some unexpected allies and find themselves unraveling a mystery that has its roots in the history of humans...

Frustrated at life with an autistic brother, twelve-year-old Catherine longs for a normal existence but her world is further complicated by a friendship with an young paraplegic.

On their second adventure through the magic mirror Abby and Jonah find themselves in the Cinderella fairy tale--and that is when things start to go really wrong.

Thirteen-year-old fraternal twins Dallas and Florida have grown up in a terrible orphanage but their lives change forever when an eccentric but sweet older couple invites them each on an adventure, beginning in an almost magical place called Ruby Holler.

"In this conclusion to the Three Dark Crowns series, three sisters will rise to fight as the secrets of Fennbirn's history are laid bare. Allegiances will shift. Bonds will be tested. But the fate of the magical island lies in the hands of its queens. It always has"--

Eleven-year-old Gregor and his younger sister, Boots, return to the Underworld beneath New York City to find the cure for a terrible plague that threatens the life of their mother, as well as the lives of the people, bats, and rats who populate the underworld.

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

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.

In a near future when life is harsh outside of Earth's last unpolluted place, Cee tries to leave an abandoned island while her sister, STEM prodigy Kasey, seeks escape from the science and home she once trusted. It's been three years since Cee woke up on the shore of an abandoned island, with no memories of life prior, or how she got there. All she knows is she has a sister-- and is determined to find her. A world away, STEM prodigy Kasey is looking...

When their favorite pizza restaurant almost goes out of business, the Alden children try to help their friends stay open while they find out who is behind all their problems.