A volatile situation inside the research facility comes to a head; Dr. Jaax steps up, but exhaustion threatens the precision needed to sterilize the threat; the press arrives, and neighbors become aware of the danger next door.

Dr. Nancy Jaax has one of the most dangerous jobs in the world handling deadly viruses; after a lab accident, she is faced with a possible Ebola outbreak on U.S. soil.

Dr. Nancy Jaax works tirelessly to find out why the virus is behaving differently than expected in human victims; unforeseen dangers arise at the research facility; Jaax is forced to make a choice between her family and her duty to her country.

An employee at the monkey research facility falls ill, causing Dr. Nancy Jaax to fear the virus has spread to the human population; Jerry Jaax searches for a way to protect his wife; Dr. Wade Carter is obsessed with exposing the dangers of Ebola.

In Florida, a man mysteriously falls ill and dies. Special Agent Matthew Ryker suspects an anthrax attack - how many others have been infected?

Ryker’s investigation moves to New York as another case of anthrax occurs. Bruce Ivins begins having suspicions of his coworkers.

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.