How does O. Henry use foreshadowing, point of view, irony, and suspense to create an effective narrative in “After Twenty Years”?

How does O. Henry use foreshadowing, point of view, irony, and suspense to create an effective narrative in “After Twenty Years”?
How does O. Henry use foreshadowing, point of view, irony, and suspense to create an effective narrative in “After Twenty Years”?
How does O. Henry use foreshadowing, point of view, irony, and suspense to create an effective narrative in “After Twenty Years”?