THE RURAL AREAS OF COLORADO ARE riddled with mysteries, particularly where dirt roads meet trails winding into the mountains. People who choose to make their lives in this tough and unforgiving environment tend to be private people who have moved out of the city and off the grid for a specific purpose. Mike Rust was one of those people, having stepped out of the limelight of mountain biking and into the remote San Luis Valley. The mystery of his disappearance, his role as a mountain bike pioneer and the eventual capture of his murderer is documented in the film “The ...