With two suspects in question, Ryker’s own beliefs about the case are tested.
All eyes shift to “Mr. Z.” As they start to zero in on a suspect, Ryker and Dani get new assignments - but that won’t stop them from chasing their lead.
The FBI learns more about Bruce Ivins’ peculiar past behaviors after an old colleague raises red flags. Ryker and Dani trace the origin of the letters.
An attack on Capitol Hill sends Ryker and his team to a mail facility that’s become a hot spot for anthrax infections.