G.H., a well-to-do Rio sculptress, enters the room of her maid, which is as clear and white 'as in an insane asylum from which dangerous objects have been removed'. There she sees a cockroach - black, dusty, prehistoric - crawling out of the wardrobe and, panicking, slams the door on it. Her irresistible fascination with the dying insect provokes a spiritual crisis, in which she questions her place in the universe and her very identity, propelling her towards an act of shocking transgression.