Two years after choosing not to kill the man who killed his son, former police sergeant Leo Barnes has become head of security for Senator Charlene Roan, the front runner in the next Presidential election due to her vow to eliminate the Purge. On the night of what should be the final Purge, a betrayal from within the government forces Barnes and Roan out onto the street where they must fight to survive the night.

A troubled man starts working at a retirement home and realizes its residents and caretakers harbor sinister secrets. As he investigates the building and its forbidden fourth floor, he starts to uncover connections to his own past and upbringing as a foster child.