Spook Country

I believe I've said before how much I like William Gibson and that Neuromancer was the first SF book that made me a hard SF reader. The problem is, he wrote a lot of crap after neuromancer-I know, because I read it all. Finally, with his last book, Pattern Recognition, there was a return to form. Ironically, for some whose first book was set in a barely recognizable future, he's been getting closer and closer to present day-which he has now reached in Spook Country.
This is a great book-beautifully written, with fantastic imager (something that has always been his forte) but it's more than that. Spooks of all kinds inhabit this book-ghosts of dead friends, family, countries on the verge of not existing. Are the characters spooks as well? They seem to be of certain places, but they may not fit in, so flit about a bit like ghosts-along with the element of spying that seems to be happening. But are they spies? Is something sinister happening? Honestly, it's not clear until almsot the end of the book what the story is-and not only is the journey enjoyable, the arrival at the destination is as well.