There is a totally trivial incident. Someone is alone in a flat that gives a view of granite hills (a very common sight at Rio de Janeiro, where she lived). Suddenly she finds a huge cockroach and has to fight or flee. And facing it, reviews her whole life, identifies with the cockroach and takes the decision to fight her fears.
The above script may not sound much, but Clarice is a master of the word, writes marvellous short stories and, as Guimaraes Rosa, another brazilian writer tells, "the Devil is on the details".