The stricken craft lurched again, and the polished nose began an almost imperceptible up-swing. The shrill scream of the rarefied atmosphere began descending the scale like a gigantic siren running down.

"Flat on the deck!" Krist yelled.

Lush, green forests stretched but scant miles below. The sound of a heavy, rich atmosphere now racing past their gleaming hull dropped to a low, moaning note and then the sound of it was gone.

The nose came up.

There was a wrenching jar and the nerve-shattering cry of tearing, scorched metal. The control-room rocked crazily, then was suddenly still, cocked at a nightmare angle, as a shuddering impact brought the wildly slewing craft to a punishing halt.

And for the four of them, there was sudden oblivion....

"Marla was as lucky as the rest of us," Ronal said. "Just the wind knocked out of her. She's coming around." The girl's silver-flecked eyes were already open and for a moment there was forgetfulness in them. "We splattered a little," Ronal told her. "You move all right?"

She was shaken, but unhurt. He helped her to a standing position on the canted deck, and saw that Krist and Logan were already taking a rapid inventory of the yacht's available tools.

"Got to look around outside," Logan was saying, shaking his bruised head a little, "before I can tell you how bad we are. But I think Krist and I can get her back into one piece."

"Can if we can go out," the tall, athletic-looking owner of the pleasure craft said. "We'll need the suits."