Alcina, a powerful sorceress dwelling on a remote island, enchants all who arrive at her shores, transforming them into animals, rocks, or trees to preserve her youth and beauty. When the knight Ruggiero lands with his companion Bradamante—who disguises herself as a man named Ricciardo—Alcina becomes infatuated with the handsome warrior. As Ruggiero succumbs to her magical charms and luxurious palace, Bradamante struggles to remind him of his true love and former life. The sorceress's sister Morgana and her servant Oronte add layers of intrigue and deception. Through cunning and determination, Bradamante works to break Alcina's spell, ultimately destroying the enchantress's power and freeing all her victims from their magical prisons. The opera explores themes of illusion versus reality, the destructive nature of obsession, and the triumph of true love over supernatural temptation.