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200 on a meeting place. And after all wasn't this an ideal rendezvous? The shop had probably been here for years. The town was full of such stores. At any rate his impression of a calculated evil increased. He felt himself the object of suspicion. It was conceivable to him that he might suffer a fate similar to Brown's—perhaps behind that hideous curtain which the Levantine and the cross-legged figure seemed to guard.

Garth started. The unequal bubbling of the pipe had accompanied all his thoughts. Constantly it would pause, then recommence. The idea which had been struggling unconsciously in the detective's brain took shape. That uneven bubbling possessed a significance beyond the pleasures of nicotine. It suggested a means of communication, a code.

While he bargained with the Levantine his confidence in this eccentric explanation increased. It condemned the occupants of the shop. Whether or not the men were connected with the plot Brown had feared against Alsop, they were decidedly objects of interest to the police. Still, if Brown had spied here, the danger was obvious. The Levantine and the man in the fez were sinister opponents. Yet Garth wanted to see behind that grotesque curtain.

For a time, listening to the bubbling, he wondered if they would let him leave the shop at all. He was in no hurry to go until he had made sure of one or two things. While fingering a rug he managed stealthily to examine the wall. It was about what