Mystery Diners season 2 episode 10
Episode title: Night Shift
Janaya, the general manager of Putter's Bar & Grill, contacts Charles for help after noticing unusually low sales during the graveyard shift. The Mystery Diners go undercover as customers and discover that the overnight bartender is running his own bar out of Putter's called "the Junkyard." During the confrontation, the bartender recognizes Charles and takes his leave from the restaurant while telling the pursuing cameraman to stop following him.
