Mayfly by JJ Asher

I just died and went to hell, because only the devil could write a narrative this utterly fu*ked,

Curren
Some say London is the greatest city in the world. But I was born hating this place, and as soon as I got out of juvie, I started running and never looked back.
Fifteen years later, I’m in bed with the Romanian mafia – and they need me more than I need them.
I don’t care what the job is, and I don’t care if I come out the other side.
But I guess that’s what makes me so good. It’s easy to win when you aren’t afraid to die.

Jude
Not all homecomings are welcome, but when you work for the King, you go where you’re told.
Having MI6 Agent in front of your name doesn’t make me a good man, though, no matter how desperately I want it to be true. Because it’s hard not to be scum with a father like mine, and a mother complacent in your abuse.
She never fought for me, but I fought for him – the shattered boy on the other side that broken fence who desperately needed to be saved.
It’s why I I do what I do.
It’s why I pretend I’m a hero.
But this job has forced me back to London, and being confronted with the memory of how he walked away might just be the thing that finally breaks me.