The Question and Answer section for The Open Window is a great resource to ask questions, find answers, and discuss the novel.
I would say that Vera is the antagoinist. She really goes after Mr. Nuttel to scare him. She has no reason to do this other than his fear entertains her.
I think the story is meant to shock the reader by Mr. Nuttel's reaction to Vera's story. Vera's story is entirely fiction but Mr, Nuttel's frayed nerves sends him into a panic. Most readers can pick up on the fact that Vera's story is rather...
Vera is the protagonist in The Open Window.