The barrier between the mortal and immortal realms has fallen and war has broken out. We discover more about Daine's ancestry (which explain a few things) and we get a nice resolution to the budding relationship between Daine and Numair.

The series ends well, though on the whole the series didn't live up to the Alanna series (nor the PotS follow up). I would have thought it's a well known rule that your protagonist has to have some flaws -- something to overcome -- to make it a really good sympathetic character. Daine unfortunately really fails in this respect, to the detriment of the entire series.