After failing to apprehend the terrorist behind a Paris attack that claimed dozens of lives, CIA agent Alice Racine is forced to live in London as a caseworker. Her mentor unexpectedly calls her back into action when the CIA discovers that another attack is imminent. Alice soon learns that the classified information she's uncovered has been compromised. Running for her life, she turns to a former soldier to help her prevent a lethal biological attack on the citizens of London.

Chris Carrington looses his father to hereditary kidney disease. He is painfully aware he may die from it as well. While dealing with the agony of his loss, Chris is unexpectedly contacted by a mysterious Russian immigrant who tells him his father did not die from natural causes. That his father was an unwitting victim of human experiments in the development of biological weapons. Pursuing the truth behind this strange revelation, Chris learns of Dr. Gurevich, the scientist who created these viruses. He meets Gurevich's beautiful daughter Anna, whose innocence, charm and intelligence ultimately become his greatest obstacle. Unable to contact his Russian informant, unable to decipher Russian documents, unwilling to use Gurevich's daughter as a pawn, Chris struggles to fight symptoms of his own disease, caught between the ticking clock of his own illness and the consuming desire for truth.

A bioterrorism incident occurs at a university in Western Australia. Chris and Piers from BSAA's anti-bioterrorism unit head to the scene to investigate, and they cooperate with former S.T.A.R.S. member Rebecca, who is teaching at the university. On the scene, they meet a mysterious young man named Tyler Howard…