I actually finished Seanan McGuire's A Killing Frost last week, but given I was on vacation...
Again, we're back in October Daye's liminal world of fairie, and we're still waiting on our Dochas Sidhe changeling to marries her cait sidhe suitor.
This time, she gets sidetracked by a quest out of the Kingdom of Saltmist, as Dianda points out her fey father Simon (who was good, then lost his way again) has to approve or he can claim insult. This sends Toby running around stirring up several hornet's nests to find Simon again, then figure out how to give him his way back. (Which involves finding something REALLY important, which becomes the point of the book by the end.)
Anyway, since it is October, everything works out fairly well in the end, with quite a few surprises along the way. Hopefully the next book shows us more of what the repercussions of those are, since I'm kind of curious as to what happens now.