Dr. Abe Mandelbaum has just moved into a retirement home. After forming an unlikely friendship with a womanizing gambler, their relationship is tested when they each try to convince a mysterious nurse that they are her long-lost father.

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.