"What do you suppose it is?" Janice asked breathlessly.

Loring shook his head. "I wish I knew. It could be a guardhouse or a signal tower or something of the sort. There's no entrance on this side, but there may be an entrance in back. It could have been erected here as a kind of sentry barrier to guard this particular part of the city. It could even be a remotely controlled robot structure, equipped with detective devices and destructive weapons."

"You really think—"

"I don't know what to think. I'd like to pound on the metal to see if it gives off a hollow sound. But I'm afraid to risk it. Even raising our voices might be dangerous and activate some delicately balanced instrument of destruction."

A look of decision came into Loring's eyes. "You stay here," he said. "Don't move or touch that wall. If there's an entrance I don't want you to be with me until I've made sure there's nothing dangerous inside."

Janice looked at him, startled. "You're not going inside?"

"I will if there's an entrance."

"But darling, don't you see? If anything happened to you I wouldn't want to go on living. You think of what could happen and all that unrealistic nonsense about shielding a woman, not letting her share a danger with a man she loves more than her own life, breaks down."

"It hasn't broken down with me," Loring said. "I'm sorry, darling, but you're staying here."

"Please, David—"