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From 1992 to 2002 Christopher O’Brien investigated over one thousand paranormal events reported in the San Luis Valley—located in South-central Colorado/North Central New Mexico. Working with law enforcement officials, ex-military, ranchers and an extensive network of skywatchers, he documented what may have been the most intense wave of unexplained activity ever seen in a single region of North America. His ten-year investigation resulted in the three books of his “mysterious valley” trilogy, The Mysterious Valley, Enter the Valley, and Secrets of the Mysterious Valley.