Child of the Prophecy by Juliet Marillier

Child of the Prophecy is the final book in Juliet Marillier's Seven Waters trilogy. Each book follows the fate of a different person, and this third book follows Fainne, the daughter of the druid Ciaran and Niamh, the sister of Liadan--who was the protagonist of the second book. I read the whole book, before I got around to checking on the internet to find out how to pronounce the lead character's name. Here's a place to find some pronunciations for Gaelic names: http://www.namenerds.com/irish/irisham.html
Fainne is apparently pronounced like Tanya, only starting with an F. Ciarian is pronounced like Kirin. The first two books in the trilogy included a pronunciation guide at the front. This third book, with the most difficult names to pronounce, did not.

Anyway, all that aside, this was a fitting finale. Unlike some multi-part series, it did not fizzle out, but ended in a very satisfying manor, which I won't reveal here. Fainne has been raised by her father, Ciaran, in near isolation. Her father has raised her to understand her Druidic heritage (from him) as well as her sorceress heritage (from her grandmother, the evil sorceress, the Lady Oonagh. When she becomes a young woman, Ciaran sends Fainne to Sevenwaters to stay with her mother's kin. It is while visiting Sevenwaters that Fainne must meet her destiny, for she is involved in the prophecy that has driven the story of all three books. Fainne struggles with her desires to protect those she loves while fighting the powerful charms of the Lady Oonagh. This was a gripping and thought-provoking finale.