With the sweltering heat hitting the triple digits and life outside the cordon returning to normal, Lex moves full steam ahead in an attempt to uncover the truth behind a potential government cover-up. Meanwhile, when Katie learns that Thomas’ entire family has succumbed to the virus, and Thomas is now missing, she and Jake set out to find him. After discovering that one of their captors may have contracted the virus, Xander and Teresa plan their escape from the grocery mart.