Klaus returns to the French Quarter of New Orleans, a place where he helped build centuries ago. Now he sees that it has been taken over by his former protege Marcel. Camille, a psychology student, doesn't believe in supernatural beings. However, she finds herself drawn to Klaus. Meanwhile, Hayley and Elijah wait to see what Klaus will do next.

Betrayal at the masquerade ball? Klaus and Rebekah come together to attempt to unravel Marcel's empire from within, in spite of Elijah's concerns. They enlist help from Sophie.

Klaus becomes angry over recent events involving the safety of his unborn baby and demands answers from Sophie. Meanwhile, gruesome remains are discovered in the bayou; and Davina reveals some shocking information about the witches.

Marcel and Rebekah fret over whether secrets hidden for nearly a century are about to be exposed. Father Kieran deals with a witch from his past. Hayley and her werewolf clan enjoy a party. Sophie discovers something shocking at the cemetery. Klaus takes some dangerous measures that will affect everybody.

Rebekah and Marcel have been trying to keep a secret from Klaus which may come to the light as we flashback to 1919. Elijah and Monique bond. Hayley takes Sabine hostage to try and get information on reversing the curse on her clan.

A discovery is made about the body Rebekah is living in. Klaus clashes with Hayley and Jackson.

Determined to make her ultimate move against the Mikaelson brothers, Aurora uses Freya as bait to lure Klaus and Elijah into a dangerous trap. Meanwhile, after being recruited by The Strix's powerful coven of witches to perform a spell that could save the lives of her closest friends, Davina finds a way to conjure up Kol, the only person who may know the key ingredient to completing the spell. Finally, Hayley is forced to make a heartbreaking sacrifice.

After being marked by The Hollow’s dark magic, both Klaus and Marcel experience the symptoms of a malevolent haunting, forcing the two adversaries on a violent collision course. Meanwhile, Hayley and Elijah head out to speak with Mary after Hayley uncovers a mysterious link between the dark magic and her former wolf pack. Finally, as an exhausted Freya risks her own life to cure Klaus’ infection, a guilt-ridden Keelin must decide whether to honor her hypocratic oath and help Freya – or flee the Mikaelson’s forever.