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.

Mackie Doyle IS the replacement. Mackie is not one of us. Though he lives in the small town of Gentry, he comes from a world of tunnels and black murky water, a world of living dead girls ruled by a little tattooed princess. He is a Replacement--left in the crib of a human baby sixteen years ago. Now, because of fatal allergies to iron, blood, and consecrated ground, Mackie is slowly dying in the human world. Mackie would give anything to live...

"When Triss wakes up after an accident, she knows that something is very wrong. She is insatiably hungry; her sister seems scared of her and her parents whisper behind closed doors. She looks through her diary to try to remember, but the pages have been ripped out. Soon Triss discovers that what happened to her is more strange and terrible than she could ever have imagined, and that she is quite literally not herself. In a quest find the truth she...

When eleven-year-old Jenny Liddy, in turmoil over learning that she is a changeling, makes a deal with a devil creature, she endangers the human race but her own cleverness, her human and fairy fathers, and the last of Ireland's high kings help to make things right.

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.

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.

Human and changeling brothers Edmund and Cinder struggle to fit into their respective worlds before joining forces to uncover why magic is disappearing from the World Below.

"Many of the adults of Blarney live in fear, knowing that the doorway to the world of Tir na nOg exists on their doorstep. At any time, the barrier between the faerie realm and the mortal world could break down, causing a dangerous imbalance. But thirteen-year-old Maddy is not afraid. And when she learns that the unicorn that holds the key to peace and harmony in both worlds is injured, she knows she will have to cross into the faerie realm and track...

Nine months after her adventures in Faerie, Izzy is reunited with her old friends to help find the lost King's Key before an evil witch can use it to steal Changelings who live on Earth.

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.