Act 4 Summary

The final Act opens, like the first Act, in the Windermere morning room. Lady Windermere is alone, wondering what happened at Lord Darlington's after she had taken advantage of the fray and slipped out unnoticed. She doesn't know what time her husband came in afterward, and is afraid Mrs. Erlynne may have told the truth about her after she left.

She decides she will tell her husband about her actions the night before, but when he comes in a few moments later she doesn't get the chance. He suggests they go away for a while together, and she agrees but insists she must see Mrs. Erlynne once more before they go. He tells her she is not to see Mrs. Erlynne anymore, because he has been mistaken in his good opinion of her. His view of her is now as black and white...