The ETU finally cracks the Hunter language, allowing Finnerman (Sarah Peirse) to set a trap. Regan (Britne Oldford) questions whether all Hunters are terrorists, or whether some may be innocents living among us.

In the fallout of the Hunter roundup, Jackson (Lewis Fitz-Gerald) and Finnerman (Sarah Peirse) are at odds with each other. The ETU's only hope of stopping The Purge is to make a risky move on the Hunter's weapons' supplier, Viktor Karp (Erroll Shand).

With The Purge imminent, the ETU has no choice but to trust an unlikely informant, leading all paths to converge at the primary Hunter base for a climactic showdown.