Happy Thurbelow finished sweeping the long barracks and leaned wearily on his broom. That is, he didn't lean on it, or it would have collapsed him to the floor, but he made the gesture. Why, he wondered, didn't the Masters make the Toughs sweep their own barracks? Perhaps the Toughs couldn't be made, or perhaps the Masters did it just from an excess of cruelty.

Happy's monstrously bloated body sagged, and his skin felt dangerously dry and tight. Happy was so adipose that his hands engulfed the broom handle like a toothpick; under the transparent skin, his flesh was clear and translucent, and there could be seen the tiny red lines of the branching veins. Happy was like a jellyfish, in huge human form.

"Shadow!" he called in a high, grating voice. "I'm going below."

Shadow appeared disconcertingly, ten feet away. Dark-skinned Shadow looked at him silently with white-rimmed eyes. Then Shadow turned and disappeared, as only Shadow could.

Hanging up the broom, Happy waddled to the iron-barred gate that prevented entrance to a downward-plunging ramp. He pressed a button beside it and waited.

He looked out the window beside the gate. The sands of the Desert of Candor stretched orange and bleak under the bronze sky. Somewhere out there to the south, across those sands, under that sky, lay the shining dome of Ophir.

The window would be easily broken, and it was large enough for even Happy's bulky body to pass through. But the oxygen-scant air of Mars would sear his lungs to quick death without a helmet; and even if it would not, Happy's skin would dry and crack in a few hours of that outside air, and he would die in slower agony.

"What is the purpose of your call?" asked an impersonal voice from the loudspeaker beside the barred gate.

"I have finished my task, Master," said Happy, puffing a little. "I seek your grace to go below."

The loudspeaker said no more, but after a moment the gate stirred and lifted into the ceiling. Happy went through it gratefully, and waddled down the gently sloping ramp. The gate descended behind him.