This was an excellent book and one that's getting a re-read as soon as my backlog of books it slightly more cleared and I have time (what's that you say? Given university that'll be years? No!). To give a quick synopsis, CtW combines aspects of Pern (such as bonding - in this case to animals called trellwolves, basically huge wild wolves long ago bonded to men) with aspects of Norse mythology (trolls, wyverns, icy wastes, and svartalfs) and it takes on some interesting concepts such as sexuality and gender.
The story is a good one; Njoll goes to the wolfheall despite his father's wishes and, bonding with Viradechtis the bitch-wolf, becomes Isolfr. Fighting of trolls ensues and full-blown war breaks out... with all that entails. It's told from Isolfr's point of view in third person, but of course the bond with Vriadechtis and the wolfheall pack gives us a whole extra set of perspectives... and an interesting set of senses; or perhaps an extension of senses that we don't exercise and use that much. The bond with Viradechtis is well-used and well-developed, with an interesting note in there. Viradechtis is not intelligent, per se; oh, she's not your average wolf, and is smart, but she's actually not intelligent. Very personlike, and actually very personable - try reading the book and not, so some extent, falling in love with Isolfr and Viradechtis both - but the latter remains a trellwolf throughout.
The book's very vivid; you feel as though you are Isolfr whilst reading, and that means you're sucked in. This could be a problem for some readers in certain scenes - the nature of the wolfheall and bond means male-male sex is a non-minor feature of the book - but those scenes are described as much in terms of feelings as actual physical acts, and they make interesting and rapid reading whilst not taking over the book or turning it into porn. Battles are bloody and you can, in fact, get that feeling, which is very powerful; but Bear & Monette control the action and don't let it go on too long, because this isn't a book about battle or war or sex or anything but Isolfr and his love for Viradechtis and the wolfheall.
I mentioned earlier that this book takes on gender-issues; the svartalfs are genderless. The effects of this, and implications, aren't well covered - and similarly, the effects of meeting a genderless peoples on Isolfr are little-covered, but in a book that stands at little over 300 pages dealing with that would have taken time not really available. However, since a sequel seems to be in the works, and possibly one focussing on the svartalfs, that might change; I can but hope, yes?
The one criticism I might have of this book is that it seems to be very densely packed and some of the ideas aren't as well-developed as one might like or expect; that may well be to do with the format of the book - 300 pages isn't enough time to explore the aspects of all the new ideas within the story, only to look into them at best briefly (the genderlessness of the svartalfar doesn't shock Isolfr as much as I might expect, probably because the story has to keep rolling on over it, for instance). However that doesn't detract much at all from the reading experience!
All in all thoroughly recommended; I had a wonderful time reading this book.