Julia Bentley, the new wife of influential Sam Bentley, arouses suspicion by her consistent and profitable success in the members' bridge games at Big Oaks Country Club. In hopes of avoiding a divisive confrontation with Sam Bentley, Club Committeeman Tom Grant asks Captain Braddock to discreetly investigate the matter. He agrees to do so, and enlists the services of reformed cardsharp Chip Madigan to observe Julia and determine the reasons for her success. Chip's background enables him to easily discern Julia's methods for obtaining winning hands and, at Captain Braddock's urging, he puts a gentle but definite end to her chicanery by giving the club members an impromptu demonstration of card manipulation techniques.
—Sam Spear