O. Henry is a short story writer famous for his ironic "twists" at the end of his stories. In "Hearts and Hands," the conflict and twist revolve around two men who are handcuffed to one another on a train in Denver. One of them is young and handsome, the other is older and glum-looking.
They sit down across from a pretty young woman dressed very elegantly. Her name is Miss Fairchild. She recognizes the younger man as someone who used to run in the same social circles, Mr. Easton. Miss Fairchild implies that she used to have romantic feelings or attraction to Mr. Easton. There is a hint that Mr. Easton feels uncomfortable and embarrassed that she has recognized him and started talking to him.
Before he can say much else, the glum faced man stops him and tells the girl that Mr. Easton is a United States marshall, who is taking the glum faced man to prison at Leavenworth. He has been sentenced to seven years for counterfeiting. Miss Fairchild seems to be impressed by Mr. Easton's new job because he is now a "dashing Western hero."
The girl starts talking about irrelevant and fluffy things, and Mr. Easton seems to be becoming more and more uncomfortable. The glum faced man asks Mr. Easton to take him out to the smoker car for a smoke, which he complies with. The excuse allows the men to leave Miss Fairchild.
When they leave, the point of view shifts to two different passengers who had been listening to the conversation between Miss Fairchild, Mr. Easton, and the glum faced man. One of them remarks on how young the marshal is, and the other corrects the mistake. It was actually the glum faced man who was the marshall, and Mr. Easton who was going to prison for seven years for counterfeiting money. The detail was that Mr. Easton's right hand was cuffed to the marshal's left hand, when both men were right handed. Clearly, the marshal would choose to cuff his non-dominant hand to the prisoner's dominant one.