What is the theme in The Killers by Ernest Hemingway?

Masculinity is another theme to consider in the story. Hemingway was very concerned with the motif of masculinity. The men look the part of stereotypical gangsters, wearing derby hats and tight overcoats and keeping their gloves on when they eat. They also talk tough, announcing their plans to kill Ole, using slang, answering questions with questions, and mocking the masculinity of George, Sam, and Nick.