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.

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.

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.

"Everyone says Lauren Tranter is exhausted, that she needs rest. And they're right; with newborn twins, Morgan and Riley, she's never been more tired in her life. But she knows what she saw: that night, in her hospital room, a woman tried to take her babies and replace them with her own ... creatures. Yet when the police arrived, they saw no one. Everyone, from her doctor to her husband, thinks she's imagining things. A month passes. And one bright...

In terms of age, Ivan fell in the older cadre of Ena's grandchildren. Younger than Canto, older than Silver and Arwen. He'd also always been the one who gave the family the least trouble-no trouble at all really. Canto was as stubborn as a bull and Silver had a steely spine, and neither ever bentfor Ena unless they wished to do so. As for Arwen, gentle, empathic Arwen could be obstinate in his own way. Like water running over stone. Slow and relentless...