The reviews thus far gave this book uniformly outstanding reviews. Me, I just don't get it--I'm a fan of the Planescape setting, but maybe I just don't read enough fantasy novels and my standards haven't been lowered by a bookshelf of mediocre fiction. This book was an absolute LABOR to get through--much of it doesn't make sense, parts that do make sense are genuinely stupid, and precious little seems to have anything to do with the Blood War--and sometimes not even the Planescape setting itself.
The plot (and I'm not giving much away here) has to do with a demon army attacking Sigil--which, last I checked, doesn't have anything to do with the Blood War. In fact, for a trilogy that's supposed to be about the unending war between demons and devils (the Abyss and Hell), there isn't a single appearance by a single devil anywhere in the story. (The devils make a cameo appearance in the first book, in a contrived scene that reads like the book editor told the author he had to have a couple of demons fight a couple of devils for a page or two.)
I virtually smacked my head in disbelief when one of the characters shouts, "The Blood War has come to Sigil!" That's like Iraqis shouting at British soldiers, "The Falklands War has come to Baghdad!"
The characters themselves are painfully, excruciatingly undeveloped, the kind that could be described by a movie studio executive who only speaks in two-word adjective-noun combinations (Boffo--"curmudgeonly gnome"; Jandau--"untrustworthy tiefling"; and so on.)
Other plot points are so bad as to be very nearly laughable: at one point, the characters climb into giant flying seeds and then have an aerial battle like X-wing fighters over the surface of the Death Star (no, I'm not kidding here); at another point several dozen demons get burned to death by hitting them with lamppost lanterns (still not kidding); and at another point an army of crazed demons invade another plane by shriking down to the size of 72,000 ants (kidding! Ok, no, I'm not).
And then there's the part where the tide of a key battle is turned by a set of musical instruments that suddenly have special properties never mentioned before, like how a bucket of water can suddenly melt the wicked witch...
The writing...well, this is always a matter of taste, but I thought the author was just an acolyte of clumsy writing and overwrought metaphors; goofy plot points can often be excused (or at least overlooked) if they're told with strong writing, but here, it's as if the author had a tin ear that he had convinced himself was made of gold.
All in all, a catastrophe, and one utterly unbefitting the trilogy that was supposed to launch a setting as excellent as Planescape.