“One for the Road,” presented first in London and then at the Pinter Festival in New York, is a much darker play.  Lasting only 45 minutes, it concerns an interrogation by whiskey-drinking Nicholas (Harold Pinter), the brutal head of the secret police in an unnamed country, which could be anywhere.  “The voice of God speaks through me,” proclaims the ruthless Nicholas, determined “to keep the world clean for God.”  He betrays little emotion as he interviews his hapless victims who are tortured offstage: ironically-named Victor (Stephen Brennan), wife Gila (Brid Brennan), and child Nicky.   The horror, suggests Pinter, is ongoing, as indicated in the daily press.