Returning to a friend's apartment after a masquerade ball where she has won first prize as a lady's maid, society girl Naida Castleton is mistaken for the housemaid by Thomas Lawlor. He is struck by her beauty, however, and in a spirit of mischief she keeps up the deception. Naida suffers a financial misfortune, and she is obliged to sell her city property and lease her summer home, which is acquired by Tom's socially ambitious mother; Naida then continues in the role of secretary to Mr. Lawlor, who does not suspect her deception. While shopping, Naida is discovered by her friends and taken to her home, where she serves them cocktails. Mrs. Lawlor arrives and, realizing the situation, pretends to be a guest. Before Tom discovers the truth, he proposes to her, and after revealing her true identity, she accepts.—AFI