Mr. Carr is a kleptomaniac and his two daughters, Madge and Joan, are to be married to Mr. Cluney and Dr. Willoughby, respectively. Pretty Nell Jones, a light-fingered maid, is engaged that afternoon by Mrs. Carr after promising her sweetheart, Jack Doogan, a crook, that she will assist him to do one last job. Peculiar and mysterious things begin to happen in the Carr home with the arrival of the happy bridegrooms-to-be. A ruby suddenly disappears from the library table, into Nell's shoe, but the empty box is discovered by Cluney in his overcoat pocket a few minutes later. The family promptly suspects Nell, and Cluney telephones for a detective. While he is in the act of 'phoning, Nell slips the jewel back into the box where it is discovered by Mr. Carr just as Cluney lays down the 'phone. Cluney is stunned by the discovery and confides in Dr. Willoughby, who unsympathetically informs Cluney that he evidently suffers from unconscious kleptomania.