There are a lot of girl-vampire-werewolf series out there, with a wide range regarding quality. Frost Burned is the most recent book in one of those series, that started out excellent, backslide into generic, but has managed to recover.
This is the tenth* book set in this particular universe, the seventh that follows the character Mercy Thompson, and I was impressed. The first few books in this series (Moon Called, Blood Bound, and Iron Kissed) are the best ones, while some of the most recent ones (Bone Crossed and River Marked) have felt rather bland, like Briggs was forced to write them in order to fulfill a contract, without having any particular plan or goal with them. In Frost Burned, Briggs is back with energy and interest.
I’m guessing it’s due to the major happening that concluded her most recent book set in this universe, but following a different set of characters. The Alpha and Omega series only has three books so far (Cry Wolf, Hunting Ground, and Fair Game) and these keep on getting better. The end of Fair Game was so spectacular, in fact, it drew me back into reading the Mercy Thompson series, just so that I could see what happens next in this universe.
And, without giving any spoilers: there is definitely a lot of fall-out.
I’m very excited about Briggs revamping (hee: re-VAMPing!) this universe, and think it was probably pretty important that she started alternating which series she was writing, so she could approach the characters with excitement rather than getting bored with them. However, I’m not entirely sure how readable any of her books are, at this point, without going back and reading the earlier ones.
Frost Burned did a pretty good job of filling in the blanks for what happened before, but it was enough that I think I need to go back and read the earlier Mercy Thompson book that I skipped entirely (Silver Borne).
Although, if you want to jump into this universe without having read any of the previous books, I would start out with Fair Game, just because it was a good book, delightful characters, the climax/epilog is really spectacular, and it sets up a whole new situation that is going to continue percolating through any future books in this universe.
* Or eleventh, if you count a novella in an anthology. Or fourteen, if you count short stories in anthologies.