Young Mollie traverses eerie, perilous lands to retrieve her baby brother, Thomas, from the Kinde Folke, malicious sprites who snatched him and left a hideous changeling in his place.

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.

Bartholomew Kettle, unable to save his sister, Hettie when she was pushed into the faery Old Country, promised he would find her but sinister forces are still at work and he must rely on Pikey, who would do almost anything to escape his past, to help find her.

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.

Rachel and her fellow Animorphs believe they have a real chance at defeating the Yeerks when they discover the location of the alien regeneration pool, but their plans are disrupted by an all-powerful Ellimist who offers them an opportunity to go live on another planet.

Thirteen-year-old Bee realizes that she is a fairy who has been switched at birth with another girl who now wants her life back.

"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"--

"We rejoin our heroine for her latest adventure just as she awakes to find herself ... in the body of a troll! Her mother is worried sick, and is perplexed by the strange creature that seems to have taken Hilda's place. Now, both of them are in a race to be reunited before Ahlberg and his safety patrol get the chance to use their new secret weapon to lay waste to the trolls, and Hilda along with them!"--Provided by publisher.

After nine-year-old Tam's baby sister is stolen away by faeries and replaced by a goblin baby, he must journey to the land of the faeries to retrieve her and bring her back home.

Duty-bound to marry her friend Tove in order to give the Trylle people their strongest king and queen in history, Wendy, a changeling troll princess, is torn between two other suitors, Finn and Loki.