As the situation inside the cordon grows more dire, Lex's frustration builds as he becomes increasingly conflicted by the messages of false hope he's being forced to send to the public. When Jana suspects something is off with Lex's demeanor, she realizes the situation may be more serious than the government is letting on and devises a plan to reach Lex directly. At the hospital, Dr. Cannerts continues working towards finding an antidote, while Jake helps Katie cope with some personal issues. Elsewhere, Leo becomes concerned for his friends inside the cordon and turns to an unlikely ally to help him. Finally, a turn of events at the grocery mart leaves Teresa and her mother in a terrifying position.

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.