Broken cloud formations dotted the midnight sky and Tharn waited patiently until one of them could obscure the full moon long enough for him to gain the foot of the steep scarp a hundred yards away. Several times small clouds blotted out Uda's radiant beams; but not until a sizable one moved into the proper position did Tharn leave the protecting shadows of the tree.
With great bounding strides, silent as the shadows themselves, Tharn crossed the clearing to the cliff's base. For a few moments he skirted its edge until he located a series of man-carved ridges which formed a rude and perilous ladder to the cave entrances above. With the sure-footedness of long practice he swarmed lightly upward, past cave after cave, until he came to rest a few feet below the yawning hole marking the entrance to Gerdak's dwelling.
He crouched there motionless, his ears straining for some indication that those within were still awake. But other than a faint sound of someone snoring, he heard nothing.
With infinite stealth he drew himself onto the ledge outside. To his unbelievably sensitive nostrils came the assorted smells of a Cro-Magnon shelter. Through the medium of scent he established that five men and two women were within, all of them his ears said were sound asleep.
Suddenly the cloud was gone from the moon's face and silver effulgence bathed the cliffside, leaving Tharn exposed to possible discovery. And so, crouching, the naked blade of his flint knife held ready, Tharn entered the lair of Gerdak, chief of a Cro-Magnon tribe.
As Tarlok, the leopard, stalks the wariest of grass-eaters, so did Tharn make his way into that black hole. No human ear would have been able to mark his passage as his naked feet, seemingly endowed with eyes of their own, threaded their way past one sleeping body after another.
Two warriors lay athwart the entrance; these Tharn stepped across, so close he could feel the animal heat from their bodies. Past a stack of spears piled against a side wall, avoiding a block of stone on which were piled several baked clay pots and dishes, skirting a heap of furs where an old woman slept, mouth open and the breath whistling between toothless gums ... these were danger points along the way.
At last he reached the rear wall of the cave—and there he found the object of his search. A lanky length of tanned human lay face up on a pile of skins, breathing heavily, arms thrown wide. A few feet away, near a side wall, lay the stocky form and hairless pate that belonged to Gerdak, the chief.
The time had come for the high point of danger in Tharn's plan. Crouching beside the sleeping form of Roban, Tharn tightened his hold on the hilt of his knife, swung his arm in a short savage arc and brought the butt of the knife hard against the young man's skull!