"I don't know--"
"If we went to the roof of the tallest building," Rodney offered, "we
might--"
Martin shook his head. "No. To be effective, the shield would have to
cover the city."
Wass stared down at the metal street, as if he could look through it.
"I wonder where it gets its power?"
"Down below, probably. If there is a down below." Martin hesitated. "We
may have to...."
"What?" Rodney prompted.