"How can we find Roper in such a madhouse as this?" he roared.

Torry winced as the amplified outburst thundered in his ears.

"Simple enough," he replied. "Fine detective you are. There's a radio compass built into Tharol Sen's suit. Roper's sending all the time. She'll go to him like a homing pigeon."

"Pigeon is right," muttered Grannar. "Hope it's not too far. A little more of this would make me neurotic. Can we trust her?"

Torry laughed. "Yes and no. She hates us, but she'll lead us to Roper. That transmitter is his only way back to Mars. And hers, too. Isn't that right, Tharol Sen?"

Fortunately her reply did not come through clearly.

Following the radio compass, which behaved erratically due to magnetic discharges, they moved through the wilderness of the mirages. Progress was deceptive, without reliable landmarks. Rugged terrain made treacherous going. Megalithic cities and monstrous mountains appeared and disappeared like patterns in a kaleidoscope. In the eccentric lighting, vision itself seemed to flicker as treacherously as a three-d projector running out of balance. Constant distortions and fading out produced mental nausea and physical insecurity.

Torry was not sure where his next step would take him. One instant he seemed to flounder on the edge of abyss. The next, he would be climbing what seemed an interminable mountain, only to have solid floors of rock shimmer and vanish before his eyes. It was impossible to see where they were going, or even be certain what it was like where they had just been. Only the needle of the radio compass held any steadiness at all, and that jerked into wild whirlings now and then as magnetic currents ebbed and flowed in the ground.

They seemed, through rifts in the mirages, to be traversing a monstrous field of jagged boulders, inclined slightly upward. Even these rocks were not always as substantial as they looked, but for the most part, they were real obstacles. The thought crossed Torry's mind that it would be a bad place for an ambush if Roper were so inclined.

When the facts materialized his fears, the pencil beam of a blaster cutting through the mirages seemed only part of a dazzling auroral display.

The explosion that followed demonstrated its reality. Rock chips and larger fragments rained about them. In the dense 

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