"You speak fairly," answered Khoda Khan. "I will protect the memsahib,and when our enemies are dead, you and I will begin our feud anew."
"Do you know anything about these murders?"
"Nay, sahib. The memsahib called me, saying Mongol dogs threatened her. I came swiftly, over the roofs, lest they seek to ambush me. None molested me. But here is something I found outside the door."
He opened his hand and exhibited a bit of silk, evidently torn from his sash. On it lay a crushed object that Harrison did not recognize. But Joan recoiled with a low cry.
"God! A black scorpion of Assam!"
"Aye—whose sting is death. I saw it running up and down before the door, seeking entrance. Another man might have stepped upon it without seeing it, but I was on my guard, for I smelled the Flower of Death as I came up the stairs. I saw the thing at the door and crushed it before it could sting me."
"What do you mean by the Flower of Death?" demanded Harrison.
"It grows in the jungles where these vermin abide. Its scent attracts them as wine draws a drunkard. A trail of the juice had somehow been laid to this door. Had the door been opened before I slew it, it would have darted in and struck whoever happened to be in its way."
Harrison swore under his breath, remembering the faint scratching noise Joan had heard outside the door.
"I get it now! They put a bottle of that juice on the stairs where it was sure to be stepped on. I did step on it, and broke it, and got the liquid on my shoe. Then I tracked down the stairs, leaving the scent wherever I stepped. Came back upstairs, stepped in the stuff again and tracked it on through the door. Then somebody downstairs turned that scorpion loose—the devil!! That means they've been in this house since I was downstairs!—may be hiding somewhere here now! But somebody had to come into the office to put the scorpion on the trail—I'll ask the clerk—"
"He sleeps like the dead," said Khoda Khan. "He did not waken when I entered and mounted the stairs. What matters if the house is full of Mongols? These doors are strong, and I am alert!" From beneath his coat he drew the terrible Khyber knife—a yard long, with an edge like a razor. "I have slain men with this," he announced, grinning like a bearded mountain devil. "Pathans, Indians, a Russian or so. These Mongols are dogs on whom the good steel will be shamed."
"Well," grunted Harrison. "I've got an appointment that's overdue now. I feel queer walking out and leaving you two to fight these devils alone. But there'll be no safety for us until I've smashed this gang at its root, and that's what I'm out to do."
"They'll kill you as you leave the building," said Joan with conviction.
"Well, I've got to risk it. If you're attacked call the police anyway, and call me, at Shan Yang's joint. I'll come back here some time before dawn. But I'm hoping the tip I expect to get will enable me to hit straight at whoever's after us."
He went down the hallway with an eerie feeling of being watched and scanned the stairs as if he expected to see it swarming with black scorpions, and he shied wide of the broken glass on the step. He had an uncomfortable sensation of duty ignored, in spite of himself, though he knew that his two companions did not want the police, and that in dealing with the East it is better to heed the advice of the East.
The clerk still sagged behind his desk. Harrison shook him without avail. The man was not asleep; he was drugged. But his heartbeat was regular, and the detective believed he was in no danger. Anyway, Harrison had no more time to waste. If he kept Johnny Kleck waiting too long, the fellow might become panicky and bolt, to hide in some rat-run for weeks.
He went into the street, where the lamps gleamed luridly through the drifting river mist, half expecting a knife to be thrown at him, or to find a cobra coiled on the seat of his automobile. But he found nothing his suspicion anticipated, even though he lifted the hood and the rumble-seat to see if a bomb had been planted. Satisfying himself at last, he climbed in and the girl watching him through the slits of a third-story shutter sighed relievedly to see him roar away unmolested.
Khoda Khan had gone through the rooms, giving approval in his beard of the locks, and having extinguished the lights in the other chambers he returned to the drawing room, where he turned out all lights there except one small desk lamp. It shed a pool of light in the center of the room, leaving the rest in shadowy vagueness.
"Darkness baffles rogues as well as honest men," he said sagely, "and I see like a cat in the dark."
He sat cross-legged near the door that let into the bedroom, which he left partly open. He merged with the shadows so that all of him Joan could make out with any distinctness was his turban and the glimmer of his eyes as he turned his head.
"We will remain in this room, sahiba," he said. "Having failed with poison and reptile, it is certain that men will next be sent. Lie down on that divan and sleep, if you can. I will keep watch."
Joan obeyed, but she did not sleep. Her nerves seemed to thrum with tautness. The silence of the house oppressed her, and the few noises of the street made her start.
Khoda Khan sat motionless as a statue, imbued with the savage patience and immobility of the hills that bred him. Grown to manhood on the raw barbaric edge of the world, where survival depended on personal ability, his senses were whetted keener than is possible for civilized men. Even Harrison's trained faculties were blunt in comparison. Khoda Khan could still smell the faint aroma of the Flower of Death, mingled with the acrid odor of the crushed scorpion. He heard and identified every sound in or outside the house —knew which were natural, and which were not.
He heard the sounds on the roof long before his warning hiss brought Joan upright on the divan. The Afghan's eyes glowed like phosphorus in the shadows and his teeth glimmered dimly in a savage grin. Joan looked at him inquiringly. Her civilized ears heard nothing. But he heard and with his ears followed the sounds accurately and located the place where they halted. Joan heard something then, a faint scratching somewhere in the building, but she did not identify it—as Khoda Khan did—as the forcing of the shutters on the bathroom window.
With a quick reassuring gesture to her, Khoda Khan rose and melted like a slinking leopard into the darkness of the bedroom. She took up a blunt-nosed automatic, with no great conviction of reliance upon it, and groped on the table for a bottle of wine, feeling an intense need of stimulants. She was shaking in every limb and cold sweat was gathering on her flesh. She remembered the cigarettes, but the unbroken seal on the bottle reassured her. Even the wisest have their thoughtless moments. It was not until she had begun to drink that the peculiar flavor made her realize that the man who had shifted the cigarettes might just as easily have taken a bottle of wine and left another in its place, a facsimile that included an unbroken seal. She fell back on the divan, gagging.
Khoda Khan wasted no time, because he heard other sounds, out in the hall. His ears told him, as he crouched by the bathroom door, that the shutters had been forced—done almost in silence, a job that a white man would have made sound like an explosion in an iron foundry—and now the window was being jimmied. Then he heard something stealthy and bulky drop into the room. Then it was that he threw open the door and charged in like a typhoon, his long knife held low.
Enough light filtered into the room from outside to limn a powerful, crouching figure, with dim snarling yellow features. The intruder yelped explosively, started a motion—and then the long Khyber knife, driven by an arm nerved to the fury of the Himalayas, ripped him open from groin to breastbone.
Khoda Khan did not pause. He knew there was only one man in the room, but through the open window he saw a thick rope dangling from above. He sprang forward, grasped it with both hands and heaved backward like a bull. The men on the roof holding it released it to keep from being jerked headlong over the edge, and he tumbled backward, sprawling over the corpse, the loose rope in his hands. He yelped exultantly, then sprang up and glided to the door that opened into the corridor. Unless they had another rope, which was unlikely, the men on the roof were temporarily out of the fight.