"I mean when I went to dress."

"Oh, you were punctual enough. When I was ready you were already in the hall."

The bewilderment of the girl grew apace.

"I am sure," said her aunt, "you enjoyed yourself. But you gave the lion's share of the dances to Captain Fontanel. If this had been at Exeter, it would have caused talk; but here you are known only to a few; however, Lady Belgrove observed it."

"I hope you are not very tired, auntie darling," said Betty, to change slightly the theme that perplexed her.

"Nothing to speak of. I like to go to a ball; it recalls my old dancing days. But I thought you looked white and fagged all the evening. Perhaps it was excitement."

As soon as breakfast was concluded, Betty escaped to her room. A fear was oppressing her. The only explanation of the mystery was that she had been to the dance in her sleep. She was a somnambulist. What had she said and done when unconscious? What a dreadful thing it would have been had she woke up in the middle of a dance! She must have dressed herself, gone to Lady Belgrove's, danced all night, returned, taken off her dress, put on her afternoon tea-gown, lain down and concluded her sleep—all in one long tract of unconsciousness.

"By the way," said her aunt next day, "I have taken tickets for Carmen, at Her Majesty's. You would like to go?"

"Oh, delighted, aunt. I know some of the music—of course, the Toreador song; but I have never heard the whole opera. It will be delightful."

"And you are not too tired to go?"