No friction heat was noticeable in the cabin and it was not unexpected. Although there was air enough to cause some friction on the outside of the ship, our velocity was far less than any we would have encountered on re-entry into the earth's atmosphere.

I watched the twin ovals which marked our landing site. The larger oasis, Lacus Major, was in full view. In the center was a shiny dark spot which glinted like polished ebony in the sunlight. And southward, a short distance north of the equator, was another spot just as dark and just as glinting. Cities, perhaps?

"What do you make of those things, Dr. Joel?" I asked, pointing out the spots.

Joel shook his head. "Our astronomers have noticed them," he said. "The one in Lacus Major is called Umbra. The other is Pnyx, at the junction of two canals. Certain people have suggested they are cities."

"Circular cities?" asked Gail, who also watched the screen.

"With a dome over them," I said. For now I saw why they glinted. That shiny surface was some transparent substance which covered the city like an inverted bowl. Beneath were blackened buildings.

"Since you're so interested in these things, Drake," said Spartan, "you can have the privilege of finding out what they are."

I caught a glimpse of Gail's frightened eyes as she looked toward me, then turned her head so I could not see her fear. But I knew what Dr. Spartan had in mind. He wanted me dead, and by sending me to the very doors of a Martian city, he might save himself the disagreeable task of committing murder.

Very, very slowly we came down toward the Martian desert. Through the windows I saw one of our companion rockets land near the rim of the double canal on our north. The ground was uneven there, being churned by furrows and crevasses, and for an instant the rocket teetered, then fell on its side.

Fortunately all of the fuel had been used up or jettisoned before it touched the ground, consequently there was no fire.