The play opens with the three major characters together in A's bedroom. Throughout the scene, A does most of the talking, frequently reminiscing and telling stories about her life. B humors her, while helping her do everyday things that have become difficult to do alone (sitting down, going to the bathroom, getting into bed). C, while getting a rare word in edgewise about the duties she's there to accomplish, is most often deterred by A's slipping into long-winded storytelling. C often challenges issue A's contradictory and nonsensical statements; but she is discouraged by B, who is clearly used to A and her habits. Act 1 ends when A, in the middle of one of her stories, has a stroke.
The play picks up with a mannequin of A lying in a bed. A, B, and C are no longer the separate entities of Act 1, but represent A at different times in her life (their ages corresponding to those of A, B, and C in Act 1). Since A, B, and C in this act are all very coherent (unlike the senile A of Act 1), the audience gets a much clearer insight into the woman's past.
At one point, the son comes in to sit by the mannequin. A and B (who are invisible to him) are not happy to see him, because of the rift between them. C (also unseen by the son) is none the wiser, because she is from a period in the woman's life before her marriage. He says nothing throughout, and leaves before the end of the play.
The play ends with A, B, and C debating about the happiest moment in their life. A has the last word, saying, "That's the happiest moment. When it's all done. When we stop. When we can stop."