"Right."

Hawkes led the way down the corridor, up a staircase, and through a door. With sudden alarm Alan found himself on one of the bridges linking the skyscrapers. The bridge was no more than a ribbon of plastic with handholds at each side; it swayed gently in the breeze.

"You better not look down," Hawkes said. "It's fifty stories to the bottom."

Alan kept his eyes stiffly forward. There was a good-sized crowd gathered on the top of the adjoining building, and he saw a metal platform of some kind.

A vender came up to them. Alan thought he might be selling tickets, but instead he held forth a tray of soft drinks. Hawkes bought one; Alan started to say he didn't want one when he felt a sharp kick in his ankle, and he hurriedly changed his mind and produced a coin.

When the vender was gone, Hawkes said, "Remind me to explain rotation to you when we get aboard the Shoot. And here it comes now."

Alan turned and saw a silvery torpedo come whistling through the air and settle in the landing-rack of the platform; it looked like a jet-powered vessel of some kind. A line formed, and Hawkes stuffed a ticket into Alan's hand.

"I have a month's supply of them," he explained. "It's cheaper that way."

They found a pair of seats together and strapped themselves in. With a roar and a hiss the Overshoot blasted away from the landing platform, and almost immediately came to rest on another building some distance away.

"We've just travelled about half a mile," Hawkes said. "This ship really moves."