Synopsis: When a Los Angeles bound passenger airline reports an inexplicable death mid-flight, Dr. Kayla Martin (Tiffani Thiessen) of the Center for Disease Control is called in to evaluate the frightening possibilities - the reality of the bird flu, the probability of a biological attack, or worse, a new virus that can't be contained. With the clock ticking and a search for Patient Zero commencing around the globe, the virus begins to spread, the body count continues to rise, and the fear cannot be stopped.