Diana stood in the middle of the room and looked at the preparations for the early start next morning with a little smile of satisfaction. Everything was _en train_; the final arrangements had all been concluded some days before. The camel caravan with the camp equipment was due to leave Biskra a few hours before the time fixed for the Mayos to start with Mustafa Ali, the reputable guide whom the French authorities had reluctantly recommended. The two big suit-cases that Diana was taking with her stood open, ready packed, waiting only for the last few necessaries, and by them the steamer trunk that Sir Aubrey would take charge of and leave in Paris as he passed through. On a chaise-longue was laid out her riding kit ready for the morning. Her smile broadened as she looked at the smart-cut breeches and high brown boots. They were the clothes in which most of her life had been spent, and in which she was far more at home than in the pretty dresses over which she had laughed with Arbuthnot. She was glad the dance was over; it was not a form of exercise that appealed to her particularly. She was thinking only of the coming tour. She stretched her arms out with a little happy laugh. "It's the life of lives, and it's going to begin all over again to-morrow morning." She crossed over to the dressing-table, and, propping her elbows on it, looked at herself in the glass, with a little friendly smile at the reflection. In default of any other confidant she had always talked to herself, with no thought for the beauty of the face staring back at her from the glass. The only comment she ever made to herself on her own appearance was sometimes to wish that her hair was not such a tiresome shade. She looked at herself now with a tinge of curiosity. "I wonder why I'm so especially happy to-night. It must be because we have been so long in Biskra. It's been very jolly, but I was beginning to get very bored." She laughed again and picked up her watch to wind. It was one of her peculiarities that she would wear no jewellery of any kind. Even the gold repeater in her hand was on a plain leather strap. She undressed slowly and each moment felt more wide-awake. Slipping a thin wrap over her pyjamas and lighting a cigarette she went out on to the broad balcony on to which her bedroom gave. The room was on the first floor, and opposite her window rose one of the ornately carved and bracketed pillars that supported the balcony, stretching up to the second story above her head. She looked down into the gardens below. It was an easy climb, she thought, with a boyish grin--far easier than many she had achieved successfully when the need of a solitary ramble became imperative. But the East was inconvenient for solitary ramble; native servants had a disconcerting habit of lying down to sleep wherever drowsiness overcame them, and it was not very long since she had slid down from her balcony and landed plumb on a slumbering bundle of humanity who had roused half