When Dennis Lindsay returns home from Mexico with his new bride Carmelita, his marriage is met with consternation by his aunt Della and his former sweetheart, Elizabeth Price. Consequently, Aunt Della, who would have preferred Elizabeth and her Plymouth Rock ancestry for a niece, schemes with Elizabeth to break up Dennis's marriage. Dennis has cut short his honeymoon to consumate an important contract with Lord Epping, and when Dennis invites his client to dinner, Elizabeth insists that she would be a better hostess than Carmelita, who Epping thinks is Dennis's secretary. Consequently, she pretends to be Dennis's wife at dinner. To thwart Elizabeth, Carmelita persuades Della's husband Matt to impersonate Lord Basil Epping. Complications arise when the real Epping arrives for dinner, and in the confusion, he is insulted and leaves without signing the contract. Carmelita, feeling responsible for the disaster, decides to leave Dennis and is joined by Uncle Matt, who thinks that he is wanted by the police for false impersonation. The pair seek refuge in Mexico, where they both file for divorce. Matt, still thinking that he is being pursued by the police, dons his Lord Epping disguise and meets Chumley, Epping's associate. Chumley, believing that Matt is Epping, tells him that he must sign the contract. The phony Epping agrees and tells Chumley to turn the signed contract over to Uncle Matt for delivery. Thus, Uncle Matt and Carmelita return to New York with contract in hand. They arrive on the eve of Dennis' marriage to Elizabeth, and Dennis, meeting Carmelita again, realizes that he still loves her. A telegram from the Mexican police notifies Carmelita that her divorce is invalid, and the next day at Elizabeth's wedding, Carmelita announces that she and Dennis are still married. Carmelita's announcement starts a food fight between the man-stealing Elizabeth and Carmelita.