in the long ago. Neither hinges, handle, lock, nor latch appeared on the surface; apparently the door was solidly embedded in the mighty rock itself. The giant laid a hand on the side of the door-frame, and Dolores waited with impatience for admission. For all her schooled self-control her eyes glinted with astonishment when Milo stood aside and bowed low, saying:

“Enter, my princess!”

Without a sound the massive door had vanished, sliding up and out of sight in the dark recess of the roof, leaving smooth, steel-lined slots at sides and bottom that reflected the polish of scrupulous care. Dolores stifled her surprise, and moved toward the heavy velvet hangings which still barred her way. These, too, were swept aside with no visible effort, and the girl stood on the threshold of the chamber of mystery.