In 2001, a series of letters laced with a deadly powder called anthrax appeared on the desks of prominent journalists and politicians in New York City and Washington D.C causing a national panic. But what started as an unprecedented case soon turned into an unsettling mystery. Who had sent these letters? And why? Join us as we trace the FBI’s costly investigation into the attacks, all with an eye toward the question that remains today: Did the FBI identify the true killer, or is this case still unresolved? Unravel the story the played out behind closed doors on Cover Up: The Anthrax Threat, listen now wherever you get your podcasts

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