On September 13, 2016, emergency dispatchers received a 911 call from a terrified woman who claimed to be kidnapped. The man holding her hostage was Shawn Grate, a serial killer whom the press later dubbed “The Ladykiller.” A key to his conviction and death sentence were Grate’s extensive recorded confessions --- all extracted by one woman: Detective Kim Mager. As an experienced specialist in sex offenses, Detective Mager was one of the officers assigned to Grate’s case. Over a period of eight days, Mager conducted one interview after another, risking her life by sitting alone in the interview room with a malevolent predator. Using brilliant psychological strategy in a lethal game of wits, Mager successfully elicited his damning confessions to five murders, kidnapping and multiple sexual assaults of women across Ohio.