Susan Powell vanished from her home in West Valley City, Utah on a cold December day in 2009. Her husband, Josh Powell had taken the couple's two sons out camping in a blizzard. He claimed to have no idea where his wife had gone. Susan has never been found. Josh was never arrested or charged with a crime, though police suspected he murdered Susan in cold blood. Reporter Dave Cawley has spent years pouring over this cold case mystery. In Prelude, he sets the stage for an unbelievable true story.