Dr. Bruce Cairn stepped into the boat which was to take him ashore, and as it swung away from the side of the liner sought to divert his thoughts by a contemplation of the weird scene. Amid the smoky flare of many lights, amid rising clouds of dust, a line of laden toilers was crawling ant-like from the lighters into the bowels of the big ship; and a second line, unladen, was descending by another gangway. Above, the jewelled velvet of the sky swept in a glorious arc; beyond, the lights of Port Said broke through the black curtain of the night, and the moving ray from the lighthouse intermittently swept the harbour waters; whilst, amid the indescribable clamour, the grimily picturesque turmoil, so characteristic of the place, the liner took in coal for her run to Rangoon.  
Dodging this way and that, rounding the sterns of big ships, and disputing the water-way with lesser craft, the boat made for shore.
 
The usual delay at the Custom House, the usual soothing of the excited officials in the usual way, and his arabîyeh was jolting Dr. Cairn through the noise and the smell of those rambling streets, a noise and a smell entirely peculiar to this clearing-house of the Near East.
 
He accepted the room which was offered to him at the hotel, without troubling to inspect it, and having left instructions that he was to be called in time for the early train to Cairo, he swallowed a whisky and soda at the buffet, and wearily ascended the stairs. There were tourists in the hotel, English and American, marked by a gaping wonderment, and loud with plans of sightseeing; but Port Said, nay all Egypt, had nothing of novelty to offer Dr. Cairn. He was there at great
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inconvenience; a practitioner of his repute may not easily arrange to quit London at a moment's notice. But the business upon which he was come was imperative. For him the charm of the place had not existence, but somewhere in Egypt his son stood in deadly peril, and Dr. Cairn counted the hours that yet divided them. His soul was up in arms against the man whose evil schemes had led to his presence in Port Said, at a time when many sufferers required his ministrations in Half-Moon Street. He was haunted by a phantom, a ghoul in human shape; Antony Ferrara, the adopted son of his dear friend, the adopted son, who had murdered his adopter, who whilst guiltless in the eyes of the law, was blood-guilty in the eyes of God!
 
Dr. Cairn switched on the light and seated himself upon the side of the bed, knitting his brows and staring straight before him, with an expression in his clear grey eyes whose significance he would have denied hotly, had any man charged him with it. He was thinking of Antony Ferrara's record; the victims of this fiendish youth (for Antony Ferrara was barely of age) seemed to stand before him with hands stretched out appealingly.
 
"You alone," they seemed to cry, "know who and what he is! You alone know of our awful wrongs; you alone can avenge them!"
 
And yet he had hesitated! It had remained for his own flesh and blood to be threatened ere he had taken decisive action. The viper had lain within his reach, and he had neglected to set his heel upon it. Men and women had suffered and had died of its venom; and he had not crushed it. Then Robert, his son, had felt the poison fang, and Dr. Cairn, who had hesitated to act upon the behalf of all humanity, had leapt to arms. He charged himself with a parent's selfishness, and his conscience would hear no defence.
 
Dimly, the turmoil from the harbour reached him where he sat. He listened dully to the hooting of a syren—that of some vessel coming out of the canal.
 
His thoughts were evil company, and, ............