Mary's honeymoon with her husband Billy is constantly interrupted by his business engagements. When Billy's company orders him to Europe, Mary goes home to bid her parents farewell. They are not home, and Mary has several hours to spend before her return train to New York. Pete Noble, an old sweetheart of Mary's, suggests that she attend a masquerade ball to pass the time. At the ball, Mary's cousin Horace recognizes her and is scandalized by Billy's absence. Mary borrows a suit of armor to disguise herself, and after several misadventures, Billy arrives and all ends happily.