In Colorado near the Cheyenne Mountains, a team of topflight engineers venture out on an ambitious cross country ski trip, using their newly invented outdoor equipment. The group of young people have the adventure of their lives-skiing, laughing, , and mugging for the camera. But when the crew was expected to arrive back from their trip, not one of them returned. Nora's investigative skills and Corrie's forensic talents are put to the test as they try to uncover what happened to the promising engineers on this cold and isolating mountain. But as more speculations and theories come to light, they fear this may be the hardest case to crack yet.