This book was a great finish to the trilogy!  Even though you know that by the end Branna and  Finbar would get together, and the powers of good will vanquish the dark.  There were some very interesting twists  going back to the 13th century with the original Sorcha and Daithi and there three kids - the original "three"  as well as the source of Cabhan's powers.  I read the first 50 or so pages one day - and then finished the book the next day, putting it down only to use the bathroom and get more coffee.