"You better come with me," the Old Man said heavily. He rose stiffly, led the way from the room.

In silence they shuffled down the corridor toward the engine room. A tic worked at the corner of the Captain's mouth, but he did not seem to notice it. "Durval held the cats off with ultra-sonics. He purified about ten tons of the stuff and stored it."

They threaded their way along a chill black catwalk to the center of the ship. In the engine room, men slumped sullenly among the big atomics. As Scott and Elderburg passed a group of the black gang, mutely dangling wrenches, there was a sudden stir.

"That's him!" One of the men had leaped up. The wrench whipped back over his shoulder. He leaped raging toward Scott. "There's the rotten...."

"Easy, Billy." He was dragged back, disarmed.

"How'd the Kastil know...."

The Captain tugged Scott's arm. "Don't bother with them. Come on."

Scott nodded numbly, followed, his head aching and a nameless wave of apprehension sliding through him. "Where are the cats?" he asked once.

Elderburg ignored him. "Put on a radiation suit."

They had stopped before a side door of the main hold. As Scott struggled into the suit his mind swirled in a chaos of thoughts. When the suit was adjusted he dropped the helmet shut and stepped forward. Through the lighter gravity of the air lock they lumbered. Then Elderburg spun the controls that opened the door.