Basically, the children in this story have a room like on Star Trek--they can tell it to be whatever they want and it is very real. In the story, they have chosen to have an African Veldt for weeks and the mother is worried about their obsession. She tells them to choose something else and they rebel. They lure the parents into the room, where the story ends with lion's roars and only the clothing of the parents in the middle of the African heat. It isn't said, but it is understood that the pretend lions in this pretend room ate the real parents.