London Falling. Interesting idea, akin to the Ben Aaronovitch books, but curiously hard to follow. I think it's the revolving characters, he keeps skipping from one to the other, and gives none of them time to develop, so I keep having to flick back a few pages. Maybe it'll sort itself out by the end but it wouldn't have benefited from building out a single protagonist rather than wheeling through four fairly indistinguishable ones.