His altimeter had switched on automatically. That was a relief. A quick glance showed the dial at 90,000 feet. The retarding jets were slowing his drop, and Case had time for a look at strange terrain below.

From his present height, it looked like rolling country. There were hills, valleys, a checkerboard of green and tan that might be cultivated ground, a river.

But most important of all, there was a city, a city of towers and pinnacles more impressive than any on Earth. Three of those towers interested Case. They stood apart, the center tower hundreds of feet higher than the two which flanked it, and all three were like fingers pointing directly at the place where the cleft had been.

Case made decisions rapidly. He had to get the ship out of the air before someone saw it. First, though, he'd have to make sure it would be air he stepped into when he got out. He had a space suit in the forward locker, but putting that on would slow him up.

An intake valve hissed away. Soon, there would be something to test. Then the hissing stopped. That was a good sign. Pressure outside the ship was almost the same as inside. There was an atmosphere.

But of what was that atmosphere composed? That was now the big question. Case set the controls and turned to the intake tank. With the turn of a petcock, there came another hiss. Case got out his cigarette lighter and flicked it into flame.

He held his breath as the flame wavered. The air in the ship was being forced away from it. But the flame did not die. Case sighed with relief. If the atmosphere supported combustion, it would support breathing.

With that important question answered, Case turned to others. Where the devil was he? He couldn't answer that, but perhaps he might discover a clue. The telecast was one way.

But the telecast had stopped ticking. Case ran the thing over the entire frequency range and got nothing. If that was a clue, it was a negative one.

He had to think it over even as he swung the ship into a long glide for a hill which looked like it might have a good deal of growth on it. Coming in low, Case saw that vegetation was sparse. But there was not another ship in these strange skies. He had to land soon.