Intent on saving Hope's life, Klaus' plan will change the lives of the Mikaelson family forever.

With Hope facing a life-threatening affliction and deteriorating quickly, Klaus travels to Mystic Falls to seek help from Caroline. Tasked with keeping Hope preoccupied in Mystic Falls, Elijah comes to a heartbreaking realization about his niece. Meanwhile, at the Salvatore School for the Young and Gifted, a run-in with Alaric Saltzman throws a wrench into Klaus' plan.

Klaus turns to Davina for help to learn more about a mysterious affliction affecting Hope. On their wedding day, Freya and Keelin make a tough decision about their future together, while Elijah is forced to confront a past memory of Hayley. Finally, Declan's growing curiosity in the city's supernatural secrets forces Marcel to step in.

Klaus helps Hope cope with her pain in an unconventional way. A figure from Elijah's past comes back seeking help. Elsewhere, Marcel takes on the nightwalkers, while Vincent deals with the fallout of a fateful decision.

As Vincent, Marcel and Josh work to clean up the city, an uprising of purist vampires leads the supernatural factions into a deadly showdown. Hope's attempt to bring her family back together leaves her struggling with the consequences. Finally, Freya makes a life-changing decision.

As pressing matters rage on in New Orleans, the Mikaelson siblings find themselves forced to set aside their differences and work together to escape a "chambre de chasse."

Ivy reveals some startling news to Klaus about the dark magic that's been keeping him away from his family. Elijah turns to some unexpected allies to save Antoinette's life.

After learning how she can get Hayley back, Hope sets off on a dangerous mission to end the mess she started. Klaus turns to Caroline for help when he discovers Hope's plan. Vincent and Freya clash over whether to let Declan in on New Orleans's supernatural secrets.

A mysterious clue sent to Klaus leads him one step closer to finding Hayley. Antoinette opens up to Elijah after her past comes back to haunt her. Meanwhile, Marcel makes a decision that puts him at odds with Klaus. Finally, Hope takes matters into her own hands to fix the mess that she's created.

Frustrated by the lack of progress made in the search for Hayley, Klaus turns up the heat by taking hostages from each of the three New Orleans supernatural factions. Freya goes to Mystic Falls to check on Hope, who has been sent back to the Salvatore School. Vincent seeks guidance from Ivy after learning that Klaus' erratic behavior is escalating.

In the immediate aftermath of having his memory erased by Marcel, Elijah awakens to find himself in the middle of nowhere and without a clue as to who he is. Unable to control his instinctive vampire ways, Elijah encounters Antoinette, a beautiful and free-spirited vampire, who helps him navigate his new life. However, a run-in with Klaus threatens to destroy the peace he's finally found.

When a mysterious disappearance brings Klaus back to New Orleans, Hope looks forward to the prospect of seeing her father again. However, when the dark magic that had been keeping them apart begins to manifest in dangerous ways across the city, Vincent turns to Ivy for guidance about what it may mean. Elsewhere, Marcel returns to New Orleans amidst increased tensions between the supernatural factions, while Freya makes a decision about her future with Keelin. Finally, Roman's surprise visit to the Mikaelson compound forces Hope to reveal some dark truths about her family.

Desperate to see her father Klaus after seven years, Hope resorts to drastic measures to bring her father back to New Orleans. Hayley attempts to minimize the fallout from Hope's actions, but not before news of what she's done ripples through the city. Meanwhile, Freya's guilt over not being able to reunite her family gets in the way of her happiness with Keelin, while Rebekah struggles with her inability to fully commit to Marcel. Finally, struggling without Elijah by his side, Klaus' murderous rampage throughout Europe leads to an unexpected encounter with Caroline Forbes.