The Hot Zone

In Florida, a man mysteriously falls ill and dies. Special Agent Matthew Ryker suspects an anthrax attack, and must discover if others have been infected.

Ryker's investigation moves to New York as another case of anthrax occurs; Bruce Ivins' co-workers start to have suspicions about him.

An attack on Capitol Hill sends Ryker and his team to a mail facility that's become a hotspot for anthrax infections.

The FBI learn more about Bruce Ivins' peculiar past behaviours after an old colleague raises red flags; Ryker and Dani trace the origin of the letters.

All eyes shift to Mr Z; Ryker and Dani get new assignments, but that won't stop them from chasing their lead.

With two suspects in question, Ryker's own beliefs about the case are tested; Bruce unravels as pressure from the FBI rises.