When a dark prophecy threatens their immortal lives, the Mikaelson family faces their greatest challenge yet. After centuries of fighting to preserve their family, Klaus Mikaelson and his brother Elijahs ruthless actions have spawned a legion of enemies. While Hayley remains at odds with Klaus, she soon aligns with the Mikaelsons when their sister Freya uncovers a prophecy foretelling the familys ruin. With the arrival of the first vampires ever sired, the Mikaelsons realize that their vampire progeny have united to eliminate their makers. As signs point to the fulfillment of this prophecy, Cami OConnell is thrust into the center of the conflict. Ultimately, the influence of the returning sire lines take a toll on trusted allies Marcel Gerard, Davina Claire and Vincent Griffith. Surrounded by enemies, the Mikaelsons enact a brutal strategy that will turn everyone against them, thus setting the course for season four.