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.

Bedeviled by evil fairies that only she can see, thirteen-year-old Tanya is sent to stay with her cold and distant grandmother at Elvesden Manor, where she and the caretaker's son solve a disturbing mystery that leads them to the discovery that Tanya's life is in danger.

Enduring lives where their differences render them outcasts, a changeling and a human child must unite when a cruel sorceress ascends the throne, placing the fates of both worlds in their hands.

"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 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.

Twelve-year-olds Tinn and Cole, raised as human twins in sleepy Endsborough, risk their lives in the Wild Wood, Oddmire Swamp, and the Deep Dark to learn which is a goblin changeling with an important mission.

When Henry Day is seven years old, he is kidnapped by ageless beings called changelings, who leave another child in Henry's place, a boy who will be his duplicate. Haunted by memories, both boys are driven to search for the keys to whom they once were before they switched places.

With Trylle, things are never as they seem. Wendy thought she finally understood who she was and what she wanted, but everything changes when the rival Vittra come after her. She's caught between two worlds, torn between love and duty, and she must decide what life she is meant to lead.

Now living at Elvesden Manor under her real name of Rowan, Red attempts to put her past behind her, while fairy messengers try to convince her to participate once more in the changeling trade and she is haunted by dreams of an old enemy who is determined to exact his revenge.

Having failed in her mission to locate the missing Skojare Queen, and capture the ex-tracker Konstantin, tracker Bryn Aven returns to Doldastam to help prepare the kingdom for war against Viktor Dalig--but dark secrets lurk in the halls of the crystal palace, and uncovering them will threaten the half-Skojare tracker and change her life and the Kanin Kingdom forever.