The Question and Answer section for The Open Window is a great resource to ask questions, find answers, and discuss the novel.
Mr. Framton Nuttel has has anxiety and frazzled "nerves". His doctor recommended moving to the country to calm him. Framtom's sister's acquaintance, Mrs. Sappleton, offered to help Framtom if he came to the country.
He went to the country to calm his nerves.
Nuttal's doctor advises Nuttal to move to the country to calm or "cure" his nervous anxieties.