"Yes," Stephen said, relieved. "That's the most likely thing, and would explain her engagement this afternoon."

"We might explore the Kasbah for an hour, and call again, to inquire."

"Let us," returned Stephen. "I should like to know that she's got in all right."

Five minutes later they had left the noisy Twentieth Century behind them, and plunged into the shadowy silence of a thousand years ago.

The change could not have been more sudden and complete if, from a gaily lighted modern street, full of hum and bustle, they had fallen down an oubliette into a dark, deserted fairyland. Just outside was the imported life of Paris, but this old town was Turkish, Arab, Moorish, Jewish and Spanish; and in Algeria old things do not change.

After all, the alley was not deserted, though it was soundless as a tomb save for a dull drumming somewhere behind thick walls. They were in a narrow tunnel, rather than a street, between houses that bent towards each other, their upper stories supported by beams. There was no electric light, scarcely any light at all save a strip of moonshine, fine as a line of silver inlaid in ebony, along the cobbled way which ascended in steps, and a faint glimmer of a lamp here and there in the distance, a lamp small and greenish as the pale spark of a glow-worm. As they went up, treading carefully, forms white as spirits came down the street in heelless babouches that made no more noise than the wings of a bat. These forms loomed vague in the shadow, then took shape as Arab men, whose eyes gleamed under turbans or out from hoods.

Moving aside to let a cloaked figure go by, Stephen brushed against the blank wall of a house, which was cold, sweating dampness like an underground vault. No sun, except a streak at midday, could ever penetrate this tunnel-street.

So they went on from one alley into another, as if lost in a catacomb, or the troubling mazes of a nightmare. Always the walls were blank, save for a deep-set, nail-studded door, or a small window like a square dark hole. Yet in reality, Nevill Caird was not lost. He knew his way very well in the Kasbah, which he never tired of exploring, though he had spent eight winters in Algiers. By and by he guided his friend into a street not so narrow as the others they had climbed, though it was rather like the bed of a mountain torrent, underfoot. Because the moon could pour down a silver flood it was not dark, but the lamps were so dull that the moonlight seemed to put them out.

Here the beating was as loud as a frightened heart. The walls resounded with it, and sent out an echo. More than one nailed door stood open, revealing a long straight passage, with painted walls faintly lighted from above, and a curtain like a shadow, hiding the end. In these passages hung the smoky perfume of incense; and from over tile-topped walls came the fragrance of roses and lemon blossoms, half choked with the melancholy scent of things old, musty and decayed. Beautiful pillars, brought perhaps from ruined Carthage, were set deeply in the whitewashed walls, looking sad and lumpy now that centuries of chalk-coats had thickened their graceful contours. But to compensate for loss of shape, they were dazzling white, marvellous as columns of carved pearl in the moonlight, they and their surrounding walls seeming to send out an eerie, bleached light of their own which struck at the eye. The uneven path ran floods of moonlight; and from tiny windows in the leaning snow-palaces—windows like little golden frames—looked out the faces of women, as if painted on backgrounds of dull yellow, emerald-green, or rose-coloured light.

They were unveiled women, jewelled like idols, white and pink as wax-dolls, their brows drawn in black lines with herkous, their eyes glittering between bluish lines of kohl, their lips poppy-red with the tint of mesouak, their heads bound in sequined nets of silvered gauze, and crowned with tiaras of gold coins. The windows were so small that the women were hidden below their shoulders, but their huge hoop-earrings flashed, and their many necklaces sent out sparks as they nodded, smiling, at the passers; and one who seemed young and beautiful as a wicked fairy, against a purple light, threw a spray of orange blossoms at Stephen's feet.