"Pull it out at right angles to the plane of the Solar System," Allenson said.

The operator touched the controls. On the radar screen, they saw a blob pursuing a dot. It had turned.

Relief washed over them. It had been close!

"In what portion of the sky would the leech be?" O'Donnell asked, his face expressionless.

"Come outside; I believe I can show you," an astronomer said. They walked to the door. "Somewhere in that section," the astronomer said, pointing.

"Fine. All right, Soldier," O'Donnell told the operator. "Carry out your orders."

The scientists gasped in unison. The operator manipulated the controls and the blob began to overtake the dot. Micheals started across the room.

"Stop," the general said, and his strong, commanding voice stopped Micheals. "I know what I'm doing. I had that ship especially built."

The blob overtook the dot on the radar screen.