When the wretched captives had returned reluctantly to their cells, uttering deep sighs of regret as they quitted the bright sunshine for the gloomy darkness of the prison, Rocco called the supposed Fidelio to one side; and, laden with spades and pickaxes, they made their way to the deepest dungeon to commence their gruesome task.

Little dreaming that the one person in all the world he most longed to see, his beloved wife, was even now approaching, Don Florestan lay suffering upon the floor of his horrible cell, with despair in his heart; for he had now been so long without food, and was so terribly exhausted, that he knew death could not be far off. All hope of escape had long since deserted him, and he had quite resigned himself to his fate, looking forward to death as the end of his sufferings; but even now the image of his beautiful Leonora shone brightly in his heart, and every now and again he would breathe her name tenderly, and stretch forth his arms with a loving gesture, as though about to embrace her visionary form, or call a passionate greeting to her, thinking in his wandering delirium that she indeed stood before him.

Just as he sank back exhausted after one of these flights of feverish fancy, Rocco the jailer entered the dungeon, followed by the trembling Leonora, who shivered as she felt the chill, damp air of the subterranean cell, and glanced apprehensively at the huddled form on the ground, fearing, yet hoping, that it would prove to be her husband.

Rocco at once proceeded to the ruined cistern situated at one side of the dungeon, and, taking his spade and pickaxe, began to dig the grave, calling to his assistant to do likewise, speaking in gruff but not unkindly tones, thinking that the youth's evident reluctance to commence the horrid task was due to the softness natural to his tender years, rather than to any deeper feeling.

At length, however, Leonora, in order to keep up her disguise, took her spade and began to assist in the work; but every now and again, she turned her eyes upon the crouching form of the poor prisoner, who appeared to be sleeping.

Presently, however, Don Florestan raised his head, and addressed the jailer; and Leonora, seeing now that he was indeed her own beloved husband, was so overcome that she sank back in a swoon. Rocco, not noticing the agitation of his assistant, approached the prisoner, who demanded, as he had already done many times before, the name of the tyrant whose cruelty thus doomed him to a living death. Rocco, knowing that the poor man was to die within the next hour, felt that there could now be no harm in granting this request; so he told Florestan that his enemy was Don Pizarro, the Governor of the prison.

The name of Pizarro recalled Leonora's wandering senses; and still keeping her face hidden from Florestan, she tried to persuade Rocco to permit her to give the captive some bread she had brought with her for this purpose. Though the jailer at first refused, his own pity for the wretched prisoner at length got the better of him, and he gave his consent, even making him drink a little wine from a small flagon he had himself brought.

No sooner had Florestan eagerly partaken of the welcome food, which quickly brought back some little strength to his weary frame, than the dreaded Pizarro entered the dungeon, his first words being to bid Rocco send his youthful assistant away. Leonora, however, though she pretended to obey, only retired into the shadows of the dungeon; and then Pizarro, flinging open his cloak, and drawing his dagger, strode towards the prisoner, and in cruel, triumphant tones bade him prepare to die, hoping to see him fall on his knees and beg for mercy.

But Florestan, who had now risen to his feet, bravely drew himself up to his full height with quiet dignity; and his look of calm contempt so exasperated the wicked Pizarro, that he sprang forward immediately, intending to stab him to the heart. Ere he could strike, however, Leonora flung herself upon him, and bade him desist; and as Pizarro, taken by surprise, drew back, she now boldly declared herself to be the wife of his intended victim.

Florestan, seeing the face of the supposed youth for the first time, was amazed to recognise his beloved Leonora; and full of joy, even in this awful moment of danger, the long separated husband and wife embraced tenderly.