A troubled Baltimore FBI agent becomes involved with a secret government unit assembled to hunt a group of ruthless terrorists, who may or may not be from this world, and who may or may not be involved in his wife's disappearance.

After a succumbing to a particularly nasty Hunter urge, young Regan learns the truth about what she is from her father ... and his knife.

The ETU's discovery of the name and suspected location of a High Value Target, dredges up old memories for Jackson. Meanwhile, Flynn, Regan and Briggs attempt a daring raid on a Turkish prison.

Regan discovers that she wasn't told the truth about her father's disappearance. Meanwhile, Flynn and Briggs race against the Hunters to acquire a scientist critical to "The Purge."

Flynn (Nathan Phillips) struggles with his self-destructive downward spiral, Regan (Britne Oldford) confronts her mother, and the Hunters make last-minute preparations for The Purge.