Delicious show-off of knowledge of North-London streets and atmosphere.

But not too sure I buy the rest. Especially I don't like the idea of a woman 'enjoying' physical violence. Too much of a male fantasy for it to sound real, let alone what message is intended to the readership, hey, try this, women are likely to enjoy extreme violence?
Then the narrator goes mad and homeless. I missed some explanation of the steps that people who care always take to at least try avoid this happening, and this man did have people around him who cared.

I admire this author for his other works that I have watched/read though.