It's VERA!!! The antagonist is the character who essentially goes up against the protagonist to enhance his/her experience in either a positive or negative way. Mr. Nuttel is the protagonist, or who the story is about. He is coming to Mrs. Sappleton's town to get away from it all, to calm down so his nerve condition can get healed. Vera is the first person he meets. She has no clue who Mr. Nuttel is -- she just guesses, based on his behavior, that he would be an easy target for mind games, SO, as the story continues, she completely plays him for a fool, letting him believe that Mr. Sappleton and his brothers died a few years ago and that Mrs. Sappleton leaves the window, or in reality, the French patio doors, open, waiting for his ghost to return.