Charles is pleased to learn that he is to go to Chicago on a business trip as a representative of the Walnut Grove farmers and wishes to take Caroline along for a holiday but Caroline would prefer that he take Mary instead so that she can see John, her fiance, again, as it has been some time since they have been together.
Everything about the trips reeks of oppulence, from the train to the motel and even the ladies of the night who kindly offer their "services" to Charles.
For Mary, the romantic reunion turns very sour when she sees that John, working as a journalist, is cheating on her with other women. (I don't think Mr Edwardswould be too pleased to know that about his adopted son!) With the engagement off, and Mary's heart temporarily broken, both she and her father and pleased to return home.
An episode of contrasts and contradictions which played well on the screen and was also very well acted by all players involved.