The play is set in the northeast suburbs of London in the month of October. It tells the story of Candida, the wife of a famous clergyman, the Reverend James Mavor Morell. Morell is a Christian Socialist, popular in the Church of England, but Candida is responsible for much of his success. Candida returns home briefly from a trip to London with Eugene Marchbanks, a young poet who wants to rescue her from what he presumes to be her dull family life.