The House of Gaian by Anne Bishop

The House of Gaian : Paperback : Penguin Putnam Inc : 9780451459428 : 0451459423 : 18 Mar 2009 : In the conclusion of the Tir Alainn trilogy, the alliance between Fae and humans may not be enough to defeat the Inquisitors, leaving them no choice but to seek out the witches of the House of Gaian. Original.