I was reading Fistful of Nothing
Finished that, it was more fun because the author really got into the vernacular of the time and place, and it took place where I use to live, the greater Los Angeles area (though I did not live underground)
Now I am reading City of Smoke and Iron. A compilation of short stories, I think mostly about the same city/area. Very dark. A little bit reminiscent of the VERY OLD Thieves World anthology.