It was almost fully light now, and the shadowy dimnesses below were sorting themselves out into decentralized Denver. The black 2001 towers off Havana were right below us, and past them the peculiar Mayan-pyramid shape of the National Farmer’s Union. The Tech Center rose in a jumble off to the left, beer cans and trapezoids, and then there was a long curve of isolated buildings all the way to downtown, an island of skyscraping towers obviously in need of a moratorium.

“Come on,” Rosa said. She started walking faster, panting along the road ahead of me and looking anxiously toward the east, where at least a black van wasn’t parked. “Coronado shouldn’t have killed El Turco. It wasn’t his fault.”

“What wasn’t his fault?”

“It was one of those time-things, what did you call it?” she said, breathing hard.

“A temporal agitation?”

“Yeah, only he didn’t know it. He thought it was there all the time, and when he brought Coronado there it wasn’t there, and he didn’t know what had happened.”

She looked anxiously to the east again, where a band of clouds extending about an inch above the horizon was beginning to turn pinkish-gray, and broke into an ungainly run. I trotted after her, trying to remember the procedure for CPR.

She ran into the pullout at the top of the dam and stopped, panting hard. She put her hand up to her heaving chest and looked out across the snow at Denver.

“So you’re saying the cities existed in some other time? In the future?”

She glanced over her shoulder at the horizon. The sun was nearly up. The narrow cloud turned pale pink, and the snow on Mt. Evans went the kind of fuschia we use in the Sunday supplements. “And you think there’s going to be another time-warp this morning?” I said.