Ten minutes later they stood outside an immense building whose walls were sleek slabs of green pellucite, shining with a radiant inner warmth of their own. The building must have been a hundred stories high, or more. It terminated in a burnished spire.

"This is it," Hawkes said. "The Central Directory Building. We'll try the Standard Matrix first."

A little dizzy, Alan followed without discussing the matter. Hawkes led him through a vast lobby big enough to hide the Valhalla in, past throngs of Earthers, into a huge hall lined on all sides by computer banks.

"Let's take this booth here," Hawkes suggested. They stepped into it; the door clicked shut automatically behind them. There was a row of blank forms in a metal rack against the inside of the door.

Hawkes pulled one out. Alan looked at it. It said, CENTRAL DIRECTORY MATRIX INFORMATION REQUISITION 1067432. STANDARD SERIES.

Hawkes took a pen from the rack. "We have to fill this out. What's your brother's full name?"

"Steve Donnell." He spelled it.

"Year of birth?"

Alan paused. "3576," he said finally.

Hawkes frowned, but wrote it down that way.