After a routine flight, a Northwest Airlink commuter plane crashes in northern Minnesota, killing everyone on board. With no flight data recorder, the analysis of physical evidence becomes critical. Radar reveals the plane's trajectory may have been deliberate to avoid icing, but why did the pilots fail to slow their rapid descent? The cockpit voice recorder raises disturbing questions about an inexperienced first officer. But as investigators dig deeper, they uncover a troubling pattern of abuse by the captain that led to a breakdown in proper management and human cooperation.