Car lotta Berlumi, a former opera singer, claims that Maria Callas will soon be forgotten and blames her for her failure on the opera stage. She argues that Callas was the reason for her being forgotten by the opera world because of her capricious behavior. Meanwhile, Maria Callas devoted her life to art and became an opera legend. But in his book “The Rival,” the writer Éric-Emmanuel Schmitt presents another side of this story. Schmitt, a well-known writer, tells this story with skill and depth, viewing it through the prism of intrigue and cruelty in the world of opera.