"You must go."

"Why? Who are you?"

"I am keeper of the city."

"You?" Michaelson laughed. Then, seeing how serious the native was, said, "What makes you think a dead city needs a keeper?"

"The spirits may return."

Michaelson crawled out of the doorway and stood up. He brushed his trousers. He pointed. "See that wall? Built of some metal, I'd say, some alloy impervious to rust and wear."

"The spirits are angry."

"Notice the inscriptions? Wind has blown sand against them for eons, and rain and sleet. But their story is there, once we decipher it."

"Leave!"

The native's lined, weathered old face was working around the mouth in anger. Michaelson was almost sorry he had mocked him. He was deadly serious.