As often happens at the end of a business trip, I had a few hours of grace. I checked out of my hotel, got coffee, and began walking.
I thought I was going to a market mentioned in my guidebook; I didn't find the market, but I found a wide waste of tracks and warehouses, broken glass and razor wire. I went alone through vacant lots and beneath bridges, in the heat of the midday sun.
It was exactly the thing I needed for my story.