At the re-opening of St. Anne's Church, Father Kieran finds himself in a great deal of trouble after a run-in with a witch from his past. Marcel and Rebekah grow concerned when the reemergence of someone they once knew threatens to expose secrets they've kept buried for nearly a century. Elsewhere, Sophie is shocked when a discovery is made at the cemetery, but she soon realizes things may not be as they seem. With the full moon looming, Hayley lets Rebekah in on her plan to throw a party for her werewolf clan, but things take a dangerous turn when uninvited guests arrive. Meanwhile, Cami is conflicted when she makes a difficult decision involving the safety of Father Kieran, and Elijah finds himself facing his own dilemma when he has to choose between Hayley and his siblings. Finally, when one of his plans fails, Klaus takes drastic measures in the Cauldron, resulting in dangerous repercussions that affect everyone involved.

In a series of flashbacks to 1919, Klaus opens up to Cami and reveals details of the devastating secret Rebekah and Marcel were trying to keep from him. Elijah forms an unlikely alliance with Monique and asks for her help in locating Sabine Elsewhere, Thierry is reluctant to get involved when Marcel and Rebekah approach him with a plan to take down the witches. Meanwhile, in the bayou, Hayley is at her wits' end and holds Sabine hostage in an attempt to get information that will reverse the curse on Phoebe's werewolf clan.