Life During Wartime by Lucius Shepard - 2.5 out of 5.
This seems an odd choice, both for an SF Masterworks book (the edition that I read), as it's neither especially great, nor offensively bad, but just okay with some good bits & some mediocre bits.
There isn't all that much SF in this book. There is some near future war technology & a some psychic shenanigans going on, but it's one of those - “is it really a SF book” kind of things.
The book is broken into five definite sections, each of which has it's own separate location & plot.