Elmer Day and his wife, Eunice, are visiting Gilbert and Maud Stone, and the two husbands, wishing to attend a masquerade, plead business engagements to escape from their wives. But the wives, discovering the invitation, also attend, and matters are complicated by changes and substitutions of costumes and the appearance of Mrs. Day's aunt and uncle. After a police raid there are general explanations and reconciliations at the police court.