1) The story describes Johnsy, a young woman who is very ill with pneumonia and believes that she will die when the last leaf falls from a vine outside her window.
2) As the leaves fall one by one, Johnsy's health declines, but an old artist named Behrman helps cheer her up and keep fighting.
3) On the last very windy night, surprisingly the last leaf does not fall, and Johnsy decides she wants to live after all and starts recovering.