"I am much indebted to you."
Robert Cairn hastily left the shop, and began to look about him for a likely hiding-place from whence, unobserved, he might watch the photographer's. An antique furniture dealer's, some little distance along on the opposite side, attracted his attention. He glanced at his watch. It was half-past ten.
If, upon the pretence of examining some of the stock, he could linger in the furniture shop for half-an-hour, he would be enabled to get upon the track of Ferrara!
His mind made up, he walked along and entered the shop. For the next half-an-hour, he passed from item to item of the collection displayed there, surveying each in the leisurely manner of a connoisseur; but always he kept a watch, through the window, upon the photographer's establishment beyond.
Promptly at eleven o'clock a taxi cab drew up at the door, and from it a slim man alighted. He wore, despite the heat of the morning, an overcoat of some woolly material; and in his gait, as he crossed the pavement to enter the shop, there was something revoltingly effeminate; a sort of cat-like grace which had been noticeable in a woman, but which in a man was unnatural, and for some obscure reason, sinister.
It was Antony Ferrara!
Even at that distance and in that brief time, Robert Cairn could see the ivory face, the abnormal, red lips, and the long black eyes of this arch fiend, this monster masquerading as a man. He had much ado to restrain his rising passion; but, knowing that all depended upon his cool action, he waited until Ferrara had entered the photographer's. With a word of apology to the furniture dealer, he passed quickly into Baker Street. Everything rested, now, upon his securing a cab before Ferrara came out again. Ferrara's cabman, evidently, was waiting for him.
A taxi driver fortunately hailed Cairn at the very moment that he gained the pavement; and Cairn, concealing himself behind the vehicle, gave the man rapid instructions:
"You see that taxi outside the photographer's?" he said.
The man nodded.