Molly knows that if she compliments her baby brother, the malicious Kinde Folk will take him away. The words accidentally spill out, however, and Molly realizes that her brother was stolen and a changeling has replaced him. She then sets out to find and rescue her baby brother, hoping that the Kinde Folk will make a trade.

"A young troll named Hawthorn is stolen from Fairyland by the Golden Wind, and becomes a changeling in our world, a place no less bizarre than Fairyland in his eyes"--

Winston Chu saves the owner of a curiosities shop from a robbery only to be gifted a broomstick and a dustpan for his trouble--items that turn out to be more a curse than a blessing when they sweep away important stuff, like his baby sister.

"Esta hermosa novela gráfica -que nació como un webcómic- narra la historia fantástica de Edmund, un hada, y El Niño, un niño humano, que fueron cambiados al nacer, como se acostumbra hacer en ocasiones entre este pueblo de antiguos seres. Edmund debe ocultarles a todos en nuestro mundo sus poderes, que crecen conforme se acerca a la adolescencia, y por su parte, El Niño (que ni siquiera tiene un nombre real) es tratado en el reino...

Sorcery and Society Book 1
If 14-year-old Cassandra Reed makes it through her first day at Miss Castwell's Institute for the Magical Instruction of Young Ladies without anyone discovering her secret, maybe, just maybe, she'll let herself believe that she really does belong at Miss Castwell's.
Except Cassandra Reed's real name is Sarah Smith and up until now, she lived her whole life in the Warren, serving a magical family, the...

"Gripping, mystical and adventurous, young readers will be as hooked as Maddy was the minute she set foot inside that creepy as hell old castle," Irish World said of The Feral Child.

Maddy, an orphan, is sick of her Irish town, and sick of her cousin Danny, one of the nastiest people you could meet. Mad as hell one evening, she crawls inside the grounds of the castle, the one place she has always been forbidden to go. Once

...

Pikey Thomas doesn't know how or why he can see the changeling girl. But there she is. Not in the cold, muddy London neighborhood where Pikey lives. Instead, she's walking through the trees and snow of the enchanted Old Country or, later, racing through an opulent hall. She's pale and small, and she has branches growing out of her head. Her name is Henrietta Kettle. Pikey's vision, it turns out, is worth something. Worth something to Hettie's brother...

After humans win the faery wars in England, a half-human, half-faery child, scorned by both races, finds himself at the center of a web of intrigue and danger when he is stalked by a sinister faery.

"Fable, the half-human daughter of the Queen of the Deep Dark, and her friends, the human and goblin brothers Cole and Tinn, discover that humans are destroying the Wild Wood, breaking the unspoken truce between the people of Endsborough and the inhabitants of the Wild Wood and leading them to war"--Publisher.

Sixteen-year-old Mackie Doyle knows that he replaced a human child when he was just an infant, and when a friend's sister disappears he goes against his family's and town's deliberate denial of the problem to confront the beings that dwell under the town, tampering with human lives.