Jellyfish and bookcovers

"Don't judge a book by its cover" another line, another saying, another cliche. I guess the world is full of surprises. This is what literary theorists consider to be a situational irony like in Chopin's Story of an Hour. Who would have considered that a tender,verbally abused  middle-aged woman could have killed a little puppy? Who would have thought that an innocent, angel like human being  could have made fun of el viejo's  corpse. Who would have conceived the idea that a poor mistreated  and defenseless woman could have used laudanum on furball (Maria's dog) to avenge years of  Humiliation she had gone through at the big house. I consider myself to be an avid reader. However, I never thought that Felicia could turn into a monster. I guess we only see the surface on people, but we never know what is  really underneath them.