The story gets under way when the lonely widow Minna Shaw finds a wounded, sky-fallen witch in her vegetable garden. The witch disappears before dawn, but leaves her old, presumably defunct broom behind. Minna begins to use it around the house and finds that "it was no better or worse than brooms she'd used before." However, one morning, Minna sees the broom sweeping by itself! Opportunistically, she trains it to chop wood and fetch water.