The Four Corners country is so named because four of the old American states met there, back when they were still significant political units. For a while, in the 20th century, it was overrun with uranium hunters, who made small impression on its tilted emptiness. It was still a favorite vacation area, and the resorts were lost in that great huddle of mountains and desert. You could have a lot of privacy here.

Gliding down over the moon-ghostly Pueblo ruins of Mesa Verde, Radek peered through the windscreen. There, ahead. Lights glowed around the walls, spread across half a mesa. Inside them was a parkscape of trees, lawns, gardens, arbors, cottage units ... the Institute housed its people well. There were four large buildings at the center, and Radek noted gratefully that several windows were still shining in them. Not that he had any compunctions about getting the great Dr. Lang out of bed, but—

He ignored the public landing field outside the walls and set his boat down in the paved courtyard.

As he climbed out, half a dozen guards came running. They were husky men in blue uniforms, armed with stunners, and the dim light showed faces hinting they wouldn't be sorry to feed him a beam. Radek dropped to the ground, folded his arms, and waited. The breath from his nose was frosty under the moon.

"What the hell do you want?"

The nearest guard pulled up in front of him and laid a hand on his shock gun. "Who the devil are you? Don't you know this is private property? What's the big idea, anyway?"

"Take it easy," advised Radek. "I have to see Dr. Lang at once. Emergency."

"You didn't call for an appointment, did you?"

"No, I didn't."