Four months after the government's attempts at exterminating the survivors, Adam and Wylie use the escape tunnel. Meanwhile, Chuck learns about Harrison's black market and tries to use it to escape the town, while Gord's food supply is stolen.

After his failed escape plan, Chuck returns to find that Wiley and Adam have brought in a scientist; Gord and Franny argue over resources; Ronnie helps Renee find her brother; Mark wants to confess to a hugging.

Ronnie discovers a commune of survivalists: Wiley is forced to make a heartbreaking choice about her son. Adam investigates Liam's background.

Granny reviews security footage for answers. Recent events take a psychological toll on Chuck. To test the cure, Liam hunts for someone turning 22.

Adam seeks an outside expert to get the leverage necessary to force the government's hand. Renee makes a move to reclaim her command of the commune.

As Adam steps up his game to negotiate an extraction, one last bargaining chip is played to win Renee's cooperation, but it could cost Mark his life.