The play takes place in the peaceable and prosperous kingdom of Berbania, which is ruled by the beloved King Fernando and his equally loved wife, Queen Valeriana. They are blessed with three sons–all mighty warriors. The eldest and heir to the throne is the pompous Prince Pedro; the second son is the dashing Prince Diego; and, the youngest, the kind-hearted Prince Juan.Their idyllic life is shattered when King Fernando is struck by a mysterious sickness and can only be healed by the song of the mythical bird, Adarna. Anyone wanting to capture the bird must travel to its home on Mount Tabor, a journey that is difficult and froth with danger. After his first two brothers fail on their quest, Prince Juan bravely takes on the task to save his father.