It had just started to rain when the black SUV pulled up in front of the old convenience store on the corner of Ashland and Mercer. The water hit the cracked pavement hard, turning the whole street into a blur of gray and neon. Dominic Castellano stepped out of the driver’s side to make a call. He was a man most people in that part of Chicago knew by name, and those who knew him usually kept their heads down.