This is one of the more unique books I have read. It is set in the (now) near past, but really is meant to be a cautionary tale about what could be the near future. It is set in the UK, but if not for the titles of the officials and some of the city names, it really could be anywhere in the world.
There are probably two dozen or more narrators. Most of the time, they are not identified by name and you need to guess how/where they fit in to the larger story.
As for story, there are really only 3 or 4 major events that take place. The rest of the book is reaction to those events. You could probably argue there is only one major event and then reaction and I could be persuaded.
Essentially, a terrorist attack takes place on a crowded passenger train and the remainder of the book it about how the people in the UK deal with that, including politicians and their families, the police, the different ethnic groups in the surrounding areas, etc.
You here the reaction and the ensuing events through the voices of the various narrators as they explain the train wreck that follows the train wreck. It reflects the simmering unrest and incivility and intolerance of the various ethnic groups that are in close proximity and the initial attack is the catalyst that sets the tensions on fire, figuratively and literally.
There are not really any characters dealt with directly, as with a normal book. Certain leaders of parties or groups are mentioned, but it is not like they could really be called characters, as such. So the book is largely a disjointed series of snippets from various voices in the community about what is going on and how they feel about it.
It is a different approach and it is jarring in some ways. For many people, this will just be too different and they will knock it for not being like a "normal novel." For me, it took a while to get used to the format and it was disjointed (I believe, intentionally). But I liked the creativity of it. I could also see enough of the current world in the book that it was a bit chilling, in a good dystopian way.
There really is no ending. There is a call for something better, but we never really find out whether that happened or not. I guess we will just need to wait and see.