You can find what you need right here at eNotes. I've pasted a link to the Masterplots article on this story, which is a part of the "My Oedipus Complex" group. In that article, you will find a brief summary, character descriptions, discussion of themes, and other details.
You can also find critical analysis of the story in the book Frank O'Connor: An Introduction, by Maurice Wohlgelernter. Penguin Classics, which published a collection of O'Connor's short stories, has a brief article on its web site as well.
Visit the links below for more information.