Former Police Sergeant Barnes becomes head of security for Senator Charlie Roan, a Presidential candidate targeted for death on Purge night due to her vow to eliminate the Purge.
Three groups of people intertwine and are left stranded in the streets on Purge Night, trying to survive the chaos and violence that occurs.
A tough-as-nails detective embarks on a relentless pursuit to free his son from a nightmarish alien warship.