Having been lucky enough to get an advance copy, I devoured it in a day.
It's difficult to say what I think without giving away spoilers but suffice to say I very much enjoyed it. It was good to see the advancement in the storyline from a previous book. Nice to see old faces, loved the comic book tie-ins (which weren't in your face).
Hoped to see more of some characters and locations but a very good addition to Aaronovitch's Peter Grant series