In Great Falls, Montana, detectives are called to the scene of a grizzly crime, a 51-year-old former corrections officer is found dead. This is the second seemingly random murder in six weeks, a chilling statistic in a city that sees only about six homicides a year. As the hunt for the killer begins, detectives race to stop him before he hurts anyone else. Now, for the first time, the killer explains what happened that night and reveals why he killed.