Mr. Stanley forbids his adult daughter, a biology student at Tredgold Women's College and the youngest of his five children, to attend a fancy dress ball in London, causing a crisis. Ann Veronica is planning to attend the dance with friends of a down-at-heel artistic family living nearby and has been chafing at other restrictions imposed for no apparent reason on her. After her father resorts to force to stop her from attending the ball, she leaves her home in the fictional south London suburb of Morningside Park in order to live independently in an apartment "in a street near the Hampstead Road" in North London. Unable to find appropriate employment, she borrows forty pounds from Mr. Ramage, an older man, without realizing she is compromising herself...