"You wait till I give you your next dancing-lesson," Sissie retorted, turning and threatening him from the stairs. "It won't be as mild as this afternoon's."

He smiled, giving an imitation of the sphinx. He was happy enough as mortals go. His wife was perhaps a little better. And he was gradually launching himself into an industrious career of idleness. Also, he had broken the ice,—the ice, that is to say, of tuition in dancing. Not a word had been spoken abroad in the house about the first dancing-lesson. He had had it while Mrs. Prohack was, in theory at least, paying calls; at any rate she had set forth in the car. Mr. Prohack and Sissie had rolled up the drawing-room carpet and moved the furniture themselves. Mr. Prohack had unpacked the gramophone in person. They had locked the drawing-room door. At the end of the lesson they had relaid the carpet and replaced the furniture and enclosed the gramophone and unlocked the door, and Mr. Prohack had issued from the drawing-room like a criminal. The thought in his mind had been that he was no end of a dog and of a brave dog at that. Then he sneered at himself for thinking such a foolish thought. After all, what was there in learning to dance? But the sneer was misplaced. His original notion that he had done something courageous and wonderful was just a notion.

The lesson had favoured the new nascent intimacy with his daughter. Evidently she was a born teacher as well as a born dancer. He perceived in two minutes how marvellous her feet were. She guided him with pressures light as a feather. She allowed herself to be guided with an intuitive responsiveness that had to be felt to be believed. Her exhortations were delicious, her reprimands exquisite, her patience was infinite. Further, she said that he had what she called "natural rhythm," and would learn easily and satisfactorily. Best of all, he had been immediately aware of the physical benefit of the exercise. The household was supposed to know naught of the affair, but the kitchen knew a good deal about it somehow; the kitchen was pleasantly and rather condescendingly excited, and a little censorious, for the reason that nobody in the kitchen had ever before lived in a house the master of which being a parent of adult children took surreptitious lessons in dancing; the thing was unprecedented, and therefore of course intrinsically reprehensible. Mr. Prohack guessed the attitude of the kitchen, and had met Machin's respectful glance with a self-conscious eye.

He now bolted the front-door and went upstairs extinguishing the lights after him. Eve had told her husband and child that she should go to bed early. He meant to have a frolicsome, teasing chat with her, for the doctor had laid it down that light conversation would assist the cure of traumatic neurasthenia. She would not be asleep, and even if she were asleep she would be glad to awaken, because she admired his style of gossip when both of them were in the vein for it. He would describe for her the evening at the studio humorously, in such a fashion as to confirm her in her righteous belief that the misguided Sissie had seen the maternal wisdom and quitted dance-studios for ever.

The lamps were out in the bedroom. She slept. He switched on a light, but her bed was empty; it had not been occupied!

"Marian!" he called in a low voice, thinking that she might be in the boudoir.

And if she was in the boudoir she must be reclining in the dark there. He ascertained that she was not in the boudoir. Then he visited both the drawing-room and the dining-room. No Marian anywhere! He stood a moment in the hall and was in a mind to ring for Machin—he could see from a vague illumination at the entrance to the basement steps that the kitchen was still inhabited—but just then all the servants came upwards on the way to the attics, and at the strange spectacle of their dancing master in the hall they all grew constrained and either coughed or hurried as though they ought not to be caught in the act of retiring to bed.

Mr. Prohack, as it were, threw a lasso over Machin, who was the last of the procession.

"Where is your mistress, Machin?" He tried to be matter-of-fact, but something unusual in his tone apparently started her.

"She's gone to bed, sir. She told me to put her hot-water bag in the bed early."