Sir Charles, a younger son with no estate, is unhappily married to the wealthier, older and "ill-bred" Lady Beauclair. Lady Beauclair is supposedly a widow, and like her daughter Peggy, is “an ill-bred woman”. Their marriage has not been consummated. He instead falls in love with his niece's friend 'Bellinda', whose real name is in fact Marianne. She is in hiding after escaping a forced marriage, and although she loves Sir Charles, she refuses to become his mistress. At the end of the play it is revealed that Lady Beauclair's first husband, Mr Flywife, is alive and back to London after several years in Jamaica. Sir Charles' marriage to Lady Beauclair is legally invalid, so he and 'Bellinda' are free to marry.
