Of Ravens and Contrails - The Myth and Reality of the Human Conquest of Nature by Gary A. McVicker

In a matter of a few weeks, two people disappear in the wilderness of the Colorado Rockies under circumstances so mysterious and potentially frightening that the forest manager, Juan Zamora, dare not disclose what he knows, not even to his wife. He has reason to believe the missing people might still be alive but living under circumstances he couldn’t even imagine. Were they taken, and if so, why?