Riley is working as Connor’s bodyguard as she covers a war in Angola. In the midst of the turmoil, he, Connor, and some Special Force soldiers are infected by an Afghan soldier suffering from a mysterious virus (with a 90% mortality rate).
The Army learns of the viral outbreak us via footage that Connor shot. Two Epidemiologists are sent to try to locate the source of the virus and hopefully a cure (or at least a vaccine). I wondered a bit about this. With such a horribly lethal and unknown virus on the loose, you would figure they would send a plethora of epidemiologists, virologists, etc. I guess they thought two were enough.
The virus is named “Z” since it is the last letter and represents the end.