How does the literary device "irony" relate to the story? What part of the story is ironic?
The irony is in the situation. Edie falls in love with Chris Watters. However, he's engaged to someone else. Watters promises to write, and so Edie waits for the letter. Since it never comes, the mailman assumes she's hanging out by the mailbox waiting for him. They end up together; that's situational irony.