One day, at the end of half a year, he came into her room and said: ‘My dear one, you must get ready for a wedding. Your eldest sister is going to be married, and I will take you to your father’s palace. When the wedding is over, I shall come and fetch you home. I will whistle outside the gate, and when you hear me, pay no heed to what your father or mother say, leave your dancing and feasting, and come to me at once; for if I have to leave without you, you will never find your way back alone through the forests.’

When the princess was ready to start, she found that he had put on his white fur skin, and was changed back into the wolf; and he swung her on to his back, and set out with her to her father’s palace, where he left her, while he himself returned home alone. But, in the evening, he went back to fetch her, and, standing outside the palace gate, he gave a long, loud whistle. In the midst of her dancing the princess heard the sound, and at once she went to him, and he swung her on his back and bore her away to his castle.

The Grey Fairy Book — Part 88

Again, at the end of half a year, the prince came into her room, as the white wolf, and said: ‘Dear heart, you must prepare for the wedding of your second sister. I will take you to your father’s palace to-day, and we will remain there together till to-morrow morning.’

The Grey Fairy Book — Part 88

So they went together to the wedding. In the evening, when the two were alone together, he dropped his fur skin, and, ceasing to be a wolf, became a prince again. Now they did not know that the princess’s mother was hidden in the room. When she saw the white skin lying on the floor, she crept out of the room, and sent a servant to fetch the skin and to burn it in the kitchen fire. The moment the flames touched the skin there was a fearful clap of thunder heard, and the prince disappeared out of the palace gate in a whirlwind, and returned to his palace alone.

The Grey Fairy Book — Part 88

But the princess was heart-broken, and spent the night weeping bitterly. Next morning she set out to find her way back to the castle, but she wandered through the woods and forests, and she could find no path or track to guide her. For fourteen days she roamed in the forest, sleeping under the trees, and living upon wild berries and roots, and at last she reached a little house. She opened the door and went in, and found the wind seated in the room all by himself, and she spoke to the wind and said: ‘Wind, have you seen the white wolf?’