Wild Card: Ace in the Hole

 is a quest in Fallout: New Vegas.

Behind the Scenes
The name is a play on words of and a reference to the phrase "A hole in the ace", it is used to describe something that can supply a sure victory when revealed.

The name of this quest is not a play on words; the figure of speech is in fact "Ace in the Hole", as written in the quest title. The meaning of the phrase, however, is indeed accurate.