After discovering that poachers have begun taking out werewolves in the bayou, Elijah and Jackson grow concerned for Hayley's safety when she fails to show up during the full moon. Meanwhile, Davina, the only one with the answer to Hayley's whereabouts, plots ways to use that to her advantage. Elsewhere, Cami approaches Klaus with her theory on who is behind the series of murders in the French Quarter, while Lucien delivers to Elijah an unsettling warning about the war brewing among the sire lines. Finally, after receiving a dire prophecy about the future of the Mikaelson siblings, Klaus takes extreme measures to determine the validity of this potential impending threat.

As the war among the sire lines continues to grow, Klaus receives an unexpected visit by a figure from his past. When Elijah suspects that Tristan is hiding something, he enlists Marcel's help to find out what he's up to. Elsewhere, Davina struggles with her role as Regent and seeks advice from Hayley. Finally, an ancient secret that is uncovered threatens to tear the Mikaelson brothers apart for good.

With a dire prophecy looming over them, Klaus and Elijah invite Lucien, Tristan and Aurora to a Thanksgiving gathering in an attempt to negotiate a truce. When Aurora reveals that she has powerful leverage over Klaus, Hayley and Freya take matters into their own hands, leading to a deadly three-way confrontation. Elsewhere, Marcel and Vincent are forced to take drastic measures when they realize Davina may be in over her head, and Cami finds herself face-to-face with a dangerous new threat.

As the city celebrates its annual Jazz Fest, an unlikely team of Mikaelson foes joins forces to take Klaus hostage. Leading the charge to get their brother back, Elijah and Freya face off against a powerful force like none they’ve ever seen before, while Hayley and Cami set their own risky plan in motion to rescue Klaus. Meanwhile, when Kol’s erratic behavior worsens, Davina has no choice but to turn to Marcel and Vincent for help.

In the wake of a ruthless plan that has left their family shattered, Klaus, Elijah and Freya desperately search for a way to take down Lucien once and for all. However, their efforts are put on hold following an urgent plea for help from Kol and Marcel. At Klaus’ insistence, Freya and Elijah reluctantly stay behind to offer their help, while Klaus and Hayley head to the bayou after uncovering Lucien’s latest plan. Once there, an unexpected showdown between Klaus and Lucien forces Freya to take matters into her own hands, setting off a chain of events that will change all of their lives forever.