This had promise, but wound up being rather dreary. The blurb on the front cover from io9 touts it as, "A perfect blend of CSI and Harry Potter," which doesn't reflect well on either (Yes, I'm one of the few people in Western civilization over the age of 12 who hasn't read Harry Potter. Or seen any of the myriad CSI spinoffs. It's not anything snobby, just haven't happened to get to either yet.) This GN was adapted from a prose novel, which perhaps I might like better.
Set in modern-day London, the story revolves around Peter Grant, a police detective who's part of a special unit who deal with cases involving magic. This case in particular involves a homicidal car ... It's a fun concept, and I like Peter and the rest of the team, but the whole book just feels kind of lackluster. Some individual scenes are exciting, but the story as a whole just seems to plod along. There's very little sense of mystery or suspense. There's also a confusing bit towards the middle of the book where Grant and Sahra arrive at a hospital room, spot a suspect who bolts, they pursue him all the way to the ground floor and out the door but he gets away, so they return to the room to talk with the people, and then suddenly there's another page where they're chasing the guy through the hospital and returning to the room again. Perhaps this was where a break between issues of the comic occurred? But there's no splash page or break or anything to indicate that, just one page right into the next. Bang! Sloppy storytelling any way you look at it. I like the ideas and the characters, but the storytelling is poor. Not sure if that's Aaronovitch or the team that adapted this to blame. You may enjoy this more than I did, but I can't really recommend it.