Big Sky by Kate Atkinson

This is my first Jackson Brodie experience, book or tv. And, to be honest, I'm left a tiny bit confused. Ok, so I enjoyed it. As a stand alone novel, it was fine. So, am I right in thinking that Jackson Brodie is a detective who does detecting? Only, because, he doesn't in this book. At all. He's sort of involved by accident and coincidence. And that's it. He's like a sideline character in a series of events. I thought it would be darker too. Which is weird given it's about a sex trafficking gang. I can't 100% pinpoint this feeling, when I think back on it. It's not like they characters were all rolling in the aisles with joviality but somehow they just didn't feel dark or threatening either. Quick summary - Vince, Stephen, Andy and Tommy are friends. Stephen, Andy and Tommy traffic girls from around the world and sell them to sex gangs. They have ties to an old sex-gang of the rich and powerful, the ringleaders of which are now in jail but dying...