I borrowed the audiobook from the public library.
There's a lot going on in this final volume of the Fever series; almost a little too much. There are also rapid shifts and surprises and reveals at every turn, making Shadowfever a fast-paced ride. Mac spends most of the book preoccupied with the big worries and has less time for her more trivial musings.
One character shift in particular is significant and not entirely believable. The ultimate conclusion is not very clearly drawn. Still, this is a mostly-satisfying conclusion to a brilliant series.