In 2008, University of Wisconsin–Madison student Brittany Zimmermann was murdered in her apartment in the middle of the day, and then the trail went cold. An unlikely informant leads the police to search for two mystery men, a theory that would steer the investigation for years. As time passed and leads fell apart, the case slowly faded from view. Twelve years later, detectives discovered the truth wasn’t buried; it had been right in front of them all along.

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