This is more a 3.5 star, but I'm rounding up to 4. I liked this book much better than the second Moirin book. It was nice to see Terre d'Ange again, and the journey to Terra Nova was a fun adventure.
I usually love seeing the gods at work in the characters' lives, and that's something that drew me to the books in the first place. However, I fear that Moirin's saga relies a bit too heavily on deus ex machina. Moirin is always following her diadh-anam or Naamah's urgings or true dreams. She seems to have very little real agency, and we get the feeling that she, like us, is just waiting around to see how everything will turn out. I wish we saw her with a much more active role in these amazing stories. When she does, it's always through a gift from some god anyway. I guess I would have liked to see more of Moirin the (possibly fallible) human heroine and less Moirin the vessel waiting to be used.
Still, the story was fun, and I liked the way it closed the Circle of Shalomon, so to speak. I loved seeing Terra Nova and meeting their people and gods. The climax seemed to be missing something for me, but I'm not sure what. It may just be that deus ex machina bit. Still, the ending was solid and a great conclusion for this trilogy.