Shay, one of the rare survivors of the epidemic sweeping the UK, has surrendered herself to the Army because she believes she's a carrier of the deadly disease. Along with other survivors, she unwillingly becomes a test subject in an effort to find a cure. When the lab where she's being held is attacked, Shay and a few others escape--with the help of Dr. Alex Cross, Kai's hated stepfather and Callie's father. Alex is the leader of the cult-like group...