Answer:
O. Henry crafts "After Twenty Years" to create surprise when He withholds the fact that Jimmy knows the identity of the other man from the start.
Step-by-step explanation:
This story is told in a third-person limited point of view, Jimmy's view and the plot presents a person who is pretending to be another one in order to arrest a wanted criminal, They hide the real identity from Bob since the beginning because Jimmy doesn't want to stop being loyal to the one that was his best friend in his youth.