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 noble knight Ruggiero lands on her island, he falls under her spell and abandons his betrothed Bradamante, who pursues him in disguise. Alcina's sister Morgana and her attendant Oberto become entangled in the web of magic and desire. As Bradamante works to break the enchantment and reclaim her lover, the true nature of Alcina's power is revealed—dependent upon a magical urn that sustains her sorcery. Through cunning and determination, Bradamante discovers the source of the sorceress's strength, leading to a dramatic confrontation. The spell is shattered, transforming the island's victims back to human form and exposing Alcina's vulnerability. Love, loyalty, and the triumph of virtue over supernatural deception drive this baroque masterpiece toward its resolution.