The story “All Summer in a Day” does end on a kind of a cliffhanger. The children let Margot out, and we don’t know what will happen. One possible ending is that the children treat her better, now that they have realized what they did to her.
In the story, a group of children live on Venus where the sun has not come out in seven years, and scientists predict it will come out on this day. The children have ostracized a classmate named Margot because she has only lived on Venus for five years, and remembers the sun when they don’t.
When the sun does not come out as quickly as expected, the children get angry and frustrated. They think it is a joke, and turn on Margot. In their disappointment, they blame her for having what they have not had. They lock her in a closet, and then the sun comes out.
The children admire the sun, but then the rain begins again. That is when they realize that they left Margot in the closet, and she missed the sun.
They stood as if someone had driven them, like so many stakes, into the floor. They looked at each other and then looked away: They glanced out at the world that was raining now and raining and raining steadily.
The children are compared again to plants. In the beginning, they were roses and then weeds. Now, they are driven by stakes. They clearly begin to feel bad.
They could not meet each other’s glances. Their faces were solemn and pale. They looked at their hands and feet, their faces down.
At this point, the story ends when they release Margot. One possible ending suggested by the children’s reaction is that they will treat Margot better. They feel bad, but she is also their equal now in a way, because they have all seen the sun.