"Knock-Out Whist," by David Levien, in in Dark City Lights, edited by Lawrence Block, Three Rooms Press, 2015.
This is a story about the levels of life in New York City, and those going up versus those going down. Jerry Riser - a riser is, of course, one who rises; it is also the part of a step that doesn't get stepped on - is a disgraced ex-cop, reborn as a shady private eye.
He has just finished a big case for one of the people at the top, causing major trouble for another one, a mayoral candidate. The politician sends thugs around to find out who hired Riser, and they offer his choice of a beating or a payoff.
He could also use the cash. On the other hand it was a question of honor, the old vintage. There were still a few bottles of it left around, and once it was uncorked, it was sticky stuff.
One of the best P.I. stories I have read this year.