A subdued cry of triumph a few minutes later brought Anthony to his side.

“This must be it,” Roger said, flashing his lamp upon a small aperture in the cliff face, almost covered by a large boulder. “Look!” He held his torch in the opening.

By screwing his head down to the level of his knees and peering round a corner of the boulder Anthony was just able to make out a dim and damp interior. “Great Scott,” he said in dismay, “I shall never be able to get inside that.”

“It is going to be a struggle,” Roger admitted, comparing his cousin’s burly bulk with the extremely small entrance. “A certain simile concerning the eye of a needle occurs to me with some force. Still, if friend Colin can do it, I should say you ought to be able to. But don’t stick half-way, or you’ll annoy the inspector when he comes exploring. Now then, expel a deep breath and follow Uncle Roger.” He dropped on his hands and knees and began to worm his way inside.

“I can’t cope with that,” observed Anthony ruefully, as he watched his cousin’s feet slowly and painfully drag themselves out of his field of vision. “I’ll watch the proceedings from the doorway.” He assumed a recumbent position and inserted his head and a portion of one shoulder in the tiny opening.

Inside was a tolerably respectable little cavern, some ten feet wide by a dozen deep, shelving at the back till ceiling met floor at an acute angle amid a medley of small rocks and fragments of stone; along one side a ledge two or three feet high and as many deep formed a natural couch, while a large, flat boulder opposite was equally useful as a table. Roger, standing upright in the centre without difficulty, was throwing his light into the various nooks and crannies with which the irregular sides were seamed.

“Any luck?” Anthony asked, twisting his head at an uncomfortable angle to improve his field of view.

Roger turned his light on to the floor. “There’s no doubt the place has been used,” he said slowly; “and used a lot. Cigarette-ends, matches, candle-ends all over the place.” He took a couple of steps toward the back and peered down among the rocks. “Half-a-dozen empty chocolate boxes,” he continued, turning over his finds. “Paper bags, sandwich wrappings, half a bun; there doesn’t seem to be anything very exciting here.” He began to roam round the little enclosure, examining its possibilities with careful attention. Stooping, he picked up half-a-dozen cigarette-stubs and scrutinised them under his lamp. “Four gaspers and two Turkish,” he delivered judgment, “the latter marked with pink at the ends. Can you deduce anything from that, Anthony? Pale ends, pink-tipped. . . . Probably Mrs. Vane smoked them while chewing her chocolates, or, alternatively, chewed her chocolates while smoking them—a purely psychological distinction which certainly won’t interest you, but in either case an abominable practice; she seems to me to have been that kind of woman. Well, Anthony, except so far as we confirm friend Colin’s story, I’m very much afraid we’ve had our journey for nothing. All these things are damp, and most of them mildewed. I can quite believe that the place hasn’t been used for over a fortnight.”

“Were you looking for anything in particular?”

“No, just hoping against hope.” He bent and peered into a cavity in one of the sides. “Half-a-dozen banana skins and the remains of an orange. Not very helpful. How very hungry this place seems to have made those two! Well, I suppose we’d better be getting back.”