Despite her well-bred upbringing, Mary had disobeyed her family’s wishes and married Steve Denby, a petty thief whose penchant for booze has left them destitute. Mary answers an ad to be a society woman’s seamstress and is hired by Mrs. Hillary. Mr. Hillary is trying to close a deal with Roger Manning and entices him by inviting him, as a dinner guest, to meet the “prettiest girl in the world.” Upon learning that the “prettiest girl” is indisposed, Mrs. Hillary, realizing that Mary had good upbringing, enlists Mary as a substitute. Naturally Mary and Manning fall in love, and, since the deal still isn’t signed, the Hillary’s hire Mary’s services for the weekend.