A young school teacher is found murdered in her apartment with no signs of forced entry, no fingerprints, and no suspects. But when detectives listen to the 911 call, they discover something impossible the voice begging for help belongs to a woman who was murdered three years earlier. As more victims appear across Chicago, investigators uncover a terrifying pattern: mysterious breathing phone calls, identical crime scenes, and a killer who seems to vanish without a trace. What begins as a routine homicide investigation quickly turns into one of the most disturbing serial murder cases the city has ever seen.

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This episode includes AI-generated content.