This novel was just about as much fun to read as the first one, Way of the Wolf. Perhaps moreso, even, since there was much less set-up and a more immediate jump into post apocalyptic vampire fighting action. Of course, by vampire fighting, I mostly mean "human minion" fighting, but David Valentine does throw down with a few of the Reapers too. He leaves the wolves after being set-up by a career-savvy jerk of a CO, and is inducted into the cats... augmented humans who serve more as spies and scouts. Of course, as a former wolf, he's really a wolf-cat... he retains the augmentations of both. This point isn't made explicitly clear, although Knight does show Valentine being able to outperform his cat-only trainer in a few things, notably sense of smell and endurance, which were legacies of his wolf upbringing. Maybe he'll also end up a bear before all is said and done.
Anyway, this is a reasonably well written and fun book. I have a few minor quibbles; the main antagonist isn't properly set-up; he seems to come a little bit out of nowhere. The ending feels a bit rushed (possibly related to the former complaint) as do a few of the interpersonal relationships. The plot is, if you strip away a few of the details, almost exactly the same as the prior book's. However, none of these are crippling flaws, and like I said, I eagerly moved on into the next book literally as soon as I finished this one.
One thing that I enjoyed was the relationship and banter between Valentine and Duvalier, aka Smoke, his cat trainer. There's some incipient sexual tension, a kind of platonic partnership that's not quite platonic, and she's as interesting a character as he is. Maybe moreso in some ways. From the looks of it, she makes recurring appearances in subsequent books as well. I certainly hope so.