Posing as William Corleone's protector, undercover officer Parker enters a dangerous crime dynasty. When his identity is exposed, the two men unite against a ruthless narcotics operation. Alex is lost, trusted mentor Reed is revealed as the traitor, and William faces his father James in a final deadly reckoning. Though the cartel collapses and the family chooses a lawful future, Parker leaves the force to support William's charity. Across the border, an untouchable kingpin survives and places both men in his sights.
