Both Margie and Vern use a book on reverse psychology to get each other to breakup with their prospective mates, Freddie and Roberta, respectively. However, the whole thing backfires when a misunderstanding causes each one to think the other is eloping.

Margie tries to get a date for Roberta with a famous opera star so she will leave Vern alone. However, the singer thinks its Margie who wants the date.

Margie writes a fake letter saying there is uranium on some property Freddie has inherited so Vern will give him a job. Vern finds out what she did and turns the tables by making Margie think their is uranium behind their apartment building.

Vern sets Margie up on a date with a client's son. Margie sees a photo of a little boy so she disguises herself as an 11-year-old girl. When her date shows up she discovers the photo was an old one and the client's son is a handsome young man. Now in order to date him she must pretend to be her own older sister.

Margie and Mr. Honeywell try to trick Vern into going to a costume party by saying Roberta will be there with another man. Meanwhile, a thief sees the guestlist and decides it will be the perfect time to rob the partygoer's apartments.

In order to get Vern to take her on a trip to Havana, Margie promises to be on her best behaviour. Events conspire to ruin her plan as all kinds of problems pop up throwing the Albright apartment into chaos.

When Vern's doctor tells him he needs to get in better shape for his insurance he does so by walking instead of going by car and cutting back on meals. This causes Margie to think her father is in financial difficulties and she tries her best to correct the problem.

When Margie receives a mink coat by mistake, she tries to impress Vern by telling him a man sent it to her. When the man who bought the coat shows up he turns out to be a U.N. delegate from Arabia who wants to add Margie to his harem.

Vern wants Margie to date someone with ambition so in retaliation she starts dating Mr. Honeywell's nephew, an obnoxious effeciency expert, who Vern dislikes.

Margie pretends to be a spy so she can meet a handsome FBI agent. When he uncovers her plot, he and Vern conspire to teach her a lesson.