"Ali of Cairo!" I cried. "Then Ali of Cairo--"
"Is the biggest slave-dealer in the East!"
"Good God! Harley--at last I understand!"
"I was slow enough to understand it myself, Knox. But once the theory presented itself I asked Wessex to get into immediate touch with the valet he had already interviewed at Deepbrow. It was the result of his inquiry to which he referred when we met him at Scotland Yard to-night. Captain Vane had a large mole on his shoulder and a girl's name, together with a small device, tattooed on his forearm--a freak of his Sandhurst days--"
"Then 'the man with the shaven skull'--"
"Is Captain Ronald Vane! May he rest in peace. But I never shall until the crook-back dealer in humanity has met his just deserts."