In the wake of 9/11, anthrax-laced letters unleashed a new wave of terror across the nation. But who was behind the attacks—and why has America nearly forgotten this story? As government buildings shut down and law enforcement scrambled to track the perpetrator, the FBI launched one of the largest and most complex investigations in its history. Untangling a web of scientific evidence and false leads, the case took unexpected turns with lasting consequences. From Wolf Entertainment, USG Audio, Dig Studios and CBC, this eight-part series grants unprecedented access to declassified materials and firsthand accounts, revealing how the anthrax attacks reshaped America—and the hidden impact that still lingers today.