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...

Beezus' biggest problem is her 4-year-old sister Ramona. Even though Beezus knows sisters are supposed to love each other, with a sister like Ramona, it seems impossible.

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.

"Sisters Beck and Avery travel to an isolated Arizona town to investigate its connection to their mother's death, but uncover more than they anticipated"--

With the help of a long lost relative, and a little magic, Sabrina Grimm and her sister Daphne try to find out who has kidnapped their parents and rescue them.

During the summer of her divorced father's remarriage and her sister's wedding, fifteen-year-old Haven comes into her own by letting go of the myths of the past.

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.

Avoiding relationships to protect her sensitive heart, plus-sized Molly supports her once-cynical twin, Cassie, when the latter has her own bout of lovesickness, a situation that is complicated by sibling dynamics and an unexpected romantic triangle.

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.

When eleven-year-old Gregor and his two-year-old sister are pulled into a strange underground world, they trigger an epic battle involving men, bats, rats, cockroaches, and spiders while on a quest foretold by ancient prophecy.