Alcina, a powerful sorceress dwelling on a remote island, enchants all who arrive at her shores, transforming her former lovers into stones, trees, and beasts to conceal her infidelities. When the knight Ruggiero lands with his companion Bradamante—who disguises herself as a man named Ricciardo to protect her beloved—Alcina's magic immediately captivates Ruggiero. Bradamante watches in anguish as her lover falls under the sorceress's spell, while Alcina's sister Morgana and the courtier Oronte become entangled in their own romantic complications. As the plot unfolds, Bradamante discovers the source of Alcina's power and devises a plan to break the enchantment. Through cunning and courage, she works to restore Ruggiero's memory and free the island's prisoners from their magical bondage, ultimately triumphing over sorcery through love and determination.