Undine was full of joy when she had saved Bertalda and Huldbrand from the dangers of the Black Valley, and brought them back safely to Castle Ringstetten. Her joy grew daily greater as her husband became kind and gentle to her as he had used to be when they dwelt together in the cottage by the lake. Indeed the knight had grown ashamed of his careless words and ways. He would never again speak harshly to Undine or leave her side to spend long hours with Bertalda; so he thought to himself. For when she had hastened to save him and the maiden from the doom which had all but overtaken them, he had seen once more, in a flash, the soul of his beautiful young wife. It shone before him now, fair and spotless in its beauty.
Bertalda, too, had been touched by the goodness of her friend. She no longer wished to mock her gentle words, and though her heart was cold, she grew more humble.
Thus trouble and care passed away from Ringstetten, and spectres no longer haunted the dark corners of the castle.
Winter came, cold and chill, but it had no power to freeze the hearts of Undine and the knight.
Spring came, and the trees grew green, and the sky shone more blue, and the little birds began to use their wings. Soon the swallows and the storks came home from their long winter journeys. And those in the castle, as they thought of the fair countries these had seen, began themselves to wish to travel.
One beautiful evening Huldbrand with his wife and Bertalda walked along the banks of the river Danube. The knight, who had ofttimes sailed down the river, told them tales of the wonderful countries through which it flowed, and of the beautiful town of Vienna, which rose so proudly on its banks.
'Ah!' said Bertalda, 'how I wish we might sail to this city of which you tell.'
And Undine, ever anxious to give pleasure to her friend, said, 'Yes, let us visit Vienna while the spring is still fair.' Huldbrand also was pleased at the thought of the journey, only once he bent toward Undine and whispered, 'Kühleborn, will we not be in his power if we sail down the river?'
His beautiful wife only laughed. She was too happy now to fear her uncle's power.
They therefore got ready for the journey with much merriment and many hopes.
When at length the three travellers, with their attendants, set out on their voyage, it seemed as though all would be as joyful as they had wished. As they sailed on, the river grew more broad, more green the grasses too in the rich meadow-lands.