Harrison worked with the celerity of trained mind and muscles that eliminates fumbling delay and bungling. He accomplished his purpose in a matter of seconds and without undue noise. A key grated in the lock as he settled himself, and then the door swung open. A giant Mongol stood limned in the opening. His head was shaven, his square features passionless as the face of a copper idol. In one hand he carried a curiously shaped ebony block, in the other a mace such as was borne by the horsemen of Ghengis Khan—a straight-hafted iron bludgeon with a round head covered with steel points, and a knob on the other end to keep the hand from slipping.
He did not see Khoda Khan because when he threw back the door, the Afghan was hidden behind it. Khoda Khan did not stab him as he entered because the Afghan could not see into the outer corridor, and had no way of knowing how many men were following the first. But the Mongol was alone, and he did not bother to shut the door. He went straight to the man lying on the floor, scowling slightly to see the rope ladder hanging down through the trap, as if it was not usual to leave it that way, but he did not show any suspicion or call to the man on the roof.
He did not examine Harrison's cords. The detective presented the appearance the Mongol had expected, and this fact blunted his faculties as anything taken for granted is likely to do. As he bent down, over his shoulder Harrison saw Khoda Khan glide from behind the door as silently as a panther.
Leaning his mace against his leg, spiked head on the floor, the Mongol grasped Harrison's shirt bosom with one hand, lifted his head and shoulders clear of the floor, while he shoved the block under his head. Like twin striking snakes the detective's hands whipped from behind him and locked on the Mongol's bull throat.
There was no cry; instantly the Mongol's slant eyes distended and his lips parted in a grin of strangulation. With a terrific heave he reared upright, dragging Harrison with him, but not breaking his hold, and the weight of the big American pulled them both down again. Both yellow hands tore frantically at Harrison's iron wrists; then the giant stiffened convulsively and brief agony reddened his black eyes. Khoda Khan had driven his knife between the Mongol's shoulders so that the point cut through the silk over the man's breastbone.
Harrison caught up the mace, grunting with savage satisfaction. It was a weapon more suited to his temperament than the dagger Khoda Khan had given him. No need to ask its use; if he had been bound and alone when the executioner entered, his brains would now have been clotting its spiked ball and the hollowed ebon block which so nicely accommodated a human head. Erlik Khan's executions varied along the whole gamut from the exquisitely subtle to the crudely bestial.
"The door's open," said Harrison. "Let's go!"
There were no keys on the body. Harrison doubted if the key in the door would fit any other in the building, but he locked the door and pocketed the key, hoping that would prevent the body from being soon discovered.
They emerged into a dim-lit corridor which presented the same unfinished appearance as the room they had just left. At the other end stairs wound down into shadowy gloom, and they descended warily, Harrison feeling along the wall to guide his steps. Khoda Khan seemed to see like a cat in the dark; he went down silently and surely. But it was Harrison who discovered the door. His hand, moving along the convex surface, felt the smooth stone give way to wood—a short narrow panel, through which a man could just squeeze. When the wall was covered with tapestry—as he knew it would be when Erlik Khan completed his house—it would be sufficiently hidden for a secret entrance.
Khoda Khan, behind him, was growing impatient at the delay, when somewhere below them both heard a noise simultaneously. It might have been a man ascending the winding stairs and it might not, but Harrison acted instinctively. He pushed and the door opened inward on noiseless oiled springs. A groping foot discovered narrow steps inside. With a whispered word to the Afghan he stepped through and Khoda Khan followed. He pulled the door shut again and they stood in total blackness with a curving wall on either hand. Harrison struck a match and a narrow stairs was revealed, winding down.
