What is the meaning of the title At Dusk?

The title refers to the time in which this story takes place, as it says it occurs at " thirty minutes past six on an early March evening" with dusk having fallen over the scene

dramatic irony occurs when the reader/audience knows more about a character's situation than the character does. the one main effect is that it gives the reader a sense of superiority, or detached superiority. the reader not only seemingly discovers what is revealed, but feels superior for doing so.