The Last of the High Kings

The Last of the High Kings by Kate Thompson
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. Sequel to: The New Policeman.

The New Policeman

The New Policeman by Kate Thompson

Irish teenager JJ Liddy discovers that time is leaking from his world into Tir na nOg, the land of the fairies, and when he attempts to stop the leak he finds out a lot about his family history, the music that he loves, and a crime his great-grandfather may or may not have committed. Sequel: The Last of the High Kings.