Unwise Child by Randall Garrett

The underground tubeway shot Mike the Angel across five miles of track at high speed. Mike left the car at Stage Twelve and headed up the stairway and down the corridor to a heavy double door marked _freight loading_.

He put on his parka and went through the door. The foyer was empty, and, like the one at the rocket landing, protected from the Antarctic blast only by a curtain of hot air. Outside that curtain, the light seemed to lose itself in the darkness of the bleak, snow-filled Wastelands. Mike ignored the snowscape and headed across the empty foyer to the door marked _entrance_.