The episode opens with Faustus Blackwood shaving when the Weird Sisters enter his bedroom. Father Blackwood's body is shown to be covered with tattoos. They inform him that they have received a strange vision. Prudence informs him that with the Anti-Pope's visit and his marriage to Zelda, she feared delaying it. The Weird Sisters hold hands and tell him that they saw a altar coffin and much bloodshed. They warn him to beware of the Spellmans, claiming they will be the undoing of the Blackwoods. Blackwood dismisses their warning and claims that the Spellmans are at his mercy. He orders them to go to bed and dream no more of blood.
Agatha and Dorcas take leave but Prudence stays behind and asks if Zelda will take his name. Blackwood confirms this is the case. When Prudence asks if Sabrina will be a Blackwood, Father Blackwood accidentally cuts himself with his razor blade. Father Blackwood vows that Sabrina will never be a Blackwood before sending Prudence to bed.
Meanwhile, Lilith, who is posing as Ms Wardwell, tells Stolas that it is time to move the "little half-breed" further towards the Dark Lord's prophecy. Stolas agrees. Just as Sabrina performed an exorcism and resurrection, she must now bring down the Church of Night. Lilith vows to set the bricks tumbling. Adam Masters enters the room and says he heard her talking to someone. "Ms Wardwell" tells him that she will be joining him in bed softly.
The following day, Zelda reassures her family that her marriage to Father Blackwood would be the re-making of their family. Zelda is delighted that the Anti-Pope, the leader of all the Churches of Darkness himself, is traveling from the Vatican Necropolis to officiate over their marriage. She believes this is an honor from the Dark Lord and looks forward to becoming Zelda Spellman-Blackwood. Hilda wishes she could be there. Zelda reassures her that she will use her influence to convince Father Blackwood to lift his excommunication and that she will have a role as the "maid of dishonor."
Sabrina does not support the wedding because she knows that Zelda does not love Father Blackwood. Zelda says that Sabrina is too young to understand and that nothing will change her plans. Salem growls and Sabrina tells Ambrose to leave her familiar alone. Ambrose demands that Salem regurgitate Leviathan but Sabrina speaks up for her familiar. Hilda realizes that Ambrose is upset about Luke Chalfant's death and tries to comfort him. Zelda does not want to hear any talk about death but only smiles this week.
Later, Sabrina tells Nick that she was only saying what she was thinking. Nick explains that it is an honor for Aunt Zelda to have the Anti-Pope officiate over her ceremony since most witches never get to meet the Anti-Pope. Nick explains that the Anti-Pope is above the High Priest and officiates over the Witches' Council, which decides witches' laws and policies. Nick says that the current Anti-Pope Enoch is a big fan but is interrupted when Sabrina sees an apparition of her father Edward Spellman's ghost.
Sabrina approaches her dad who says he has come to warn that Faustus Blackwood brought down the plane that killed her mother and him. Edward tells Sabrina to stop Zelda from marrying Faustus because he will do the same to her. He also tells Sabrina to complete his manifesto before disappearing. Sabrina takes a deep breath and walks away to tell Nick. However, the apparition is an illusion created by Lilith, who remarks that Sabrina will "bring down the temple."
Meanwhile, Zelda sees an apparition of Constance Blackwood while hanging out bedsheets. Prudence arrives and asks Zelda to petition the High Priest to grant her a family name. Zelda is reluctant but Prudence reminds her that she helped her to deliver the twins and kept their secret. Zelda says she will speak to the High Priest but can't guarantee any promises. After Prudence leaves, Sabrina demands to know what she was doing here. Zelda tells her to mind her own business but Sabrina insists that they have a family meeting.
Inside the house, Sabrina recounts her encounter with her father’s ghost blaming Father Blackwood for killing her parents. Zelda is dismissive of Sabrina’s story while Hilda quips that there are a lot of hauntings near weddings. Zelda says that an independent inquiry conducted by the Witch Council into her parents' deaths concluded that the plane crash was the result of mechanical error. Zelda says that the ghost was ill-informed. Sabrina then mentions that her father’s ghost told her to finish his manifesto. Hilda recalls the manifesto but Zelda dismisses her father’s manifesto as nothing more than romantic musings about "mortal-witch intermingling."
Sabrina is annoyed with Zelda for not taking her seriously but Zelda responds that Sabrina was drinking absinthe in the afternoon when her visitation occurred. Zelda refuses to discuss the matter and releases Sabrina from her bridesmaid duties. Zelda says that she is worried about the spectre of Lady Blackwood, which she saw wondering the cemetery with malicious intent. Zelda tasks Hilda with dealing with ghosts. Zelda tells Sabrina that she will only take her account seriously when he sees Edward's ghost.
Later, Ambrose tells Sabrina might be right because he heard a tarot reading where Father Blackwood told him to murder his family. Ambrose adds that Blackwood inducted him into a secret society of warlocks that will meet the night before the Anti-Pope's arrival. Sabrina tells Ambrose they have to find out everything. She believes that the High Priest is breaking her family, having murdered her parents and seeking to marry Aunt Zelda. Sabrina thinks that too much is happening around her wedding for this to be a coincidence. When Ambrose asks her about the role of the Anti-Pope, Sabrina says she doesn’t know but knows someone who can help.
Since "Ms. Wardwell" was purportedly her father's secretary, Sabrina visits her and recounts her encounter with Edward’s ghost. She asks "Ms Wardwell" about the circumstances of her parents’ death. Lilith claims the Witches Council's inquiry into the plane crash was a whitewash orchestrated by Father Blackwood. When Sabrina asks why Father Blackwood would kill her father and what work Edward left unfinished, Lilith claims that he was traveling to the Vatican Necropolis to deliver his manifesto to the Anti-Pope, which she describes as a bold doctrine to reform the Church of Night. Lilith also claims that the Manifesto is lost beneath the ocean.
Sabrina asks where the plane crashed. "Ms Wardwell" tells her that the plane crashed somewhere in the Devil's Triangle. Sabrina offers to retrieve the manifesto and Lilith tells her that her parents would not have died in vain. Sabrina vows to finish her father's life work.
Father Blackwood is discussing the seating plans for their wedding reception with Zelda. Zelda petitions Father Blackwood to lift his excommunication on Hilda. Blackwood replies that Hilda witnessed a Catholic baptism. Zelda says that her sister has been atoning for the past several months. Blackwood agrees to lift Hilda's excommunication and asks if Hilda will be present. Zelda then makes a second appeal on behalf of Prudence.
Later, Adam asks "Ms Wardwell" about Sabrina's visit, praising his fiancee for her dedication to her students. Adam proposes that they marry, shocking Ms Wardwell.
Meanwhile, Sabrina reassures Salem that Nick can hold his breath for more than four minutes. Nick emerges from the bathtub portal, having retrieved the manifesto from the plane wreckage after fighting a giant squid. Hilda enters the bathroom and tells Sabrina that she is needed to act as bait for Lady Blackwood. She also tells Nick to put a shirt on.
Later, Hilda and Sabrina use candles to set a trap for Constance. Lady Blackwood approaches a hooded figure on a chair, whom she mistakes for Zelda. She threatens to haunt Zelda and her family. Hilda surfaces, remarking that spirits are like moths drawn to candles. Sabrina reveals herself as the hooded figure. Hilda threatens to trap Lady Constance in a tin box filled with sanctified grave dirt unless she tells them why she is haunting her sister.
Lady Blackwood claims that Zelda killed her and stole her babies and wants to steal her husband. Hilda tells Constance that Zelda tried to save her life and that of her children. Constance tells her that Sister Shirley Jackson loosened her grave and told her. Hilda responds that Sister Jackson is acting out of spite. Hilda convinces Constance to rest in peace for good before blowing out the candles.
Meanwhile, Father Blackwood holds a memorial service for the late Lucas Chalfant during a meeting of the Judas Society. Blackwood outlines his Five Facets of Judas. His followers chant hail Satan before dismissing his followers. Father Blackwood then speaks with Ambrose privately and tasks him with guarding the Anti-Pope during his stay at the Academy before he arrives at Greendale. Blackwood explains that would have been Lucas' responsibility.
Meanwhile, Zelda tells Hilda that she has convinced Father Blackwood to lift her excommunication, allowing her to serve her duties as Maid of Dishonor. Hilda tells her that she has sent Lady Constance back to the grave and reveals Sister Jackson as the real villain. Zelda wishes that she killed Sister Jackson but Hilda reassures her that she will take care of her by "sorting out their differences over tea and biscuits."
Zelda gives her one more important duty: to attend to her if the Dark Lord arrives before the wedding. Zelda fears that the Dark Lord will visit her the night before the wedding and claim her for himself. Hilda vows to do anything for her sister.
Elsewhere, Sabrina shows Nick her father's five-point manifesto. Sabrina thinks that her parents were traveling to the Vatican to reform the Church of Night and that Father Blackwood murdered them before they could do that. Ambrose says he believes her and tells both Sabrina and Nick that he attended a meeting of the Judas Society.
He tells her about Blackwood's manifesto, which he describes as a misogynistic regression to the "old ways." Ambrose explains that Blackwood plans to present his manifesto to the Anti-Pope and that he will be stationed outside Blackwood's office during the meeting. Sabrina says she could take advantage of that to present her father's manifesto to the Anti-Pope, derailing Blackwood’s plot to regress the Church of Night and the wedding.
Later that night, the Judas Society stands guard as the Anti-Pope meets with Father Blackwood and Zelda. The Anti-Pope compliments Zelda's beauty and accompanies them into the Academy. Prudence speaks with Zelda but she apologizes that her father won't budge despite her efforts. Father Blackwood introduces Nick Smith to the Anti-Pope. Sabrina also introduces her to the Anti-Pope, who praises her father for his work as a High Priest and skills as a warlock. Father Blackwood frowns. The Anti-Pope says that he sadly perished before they could meet and discuss his philosophies. Father Blackwood offers to give the Anti-Pope a tour of the Academy.
When Prudence asks her father if he is going to introduce her and the Weird Sisters, Father Blackwood introduces her as Prudence Night, describing her as one of the "gutter orphans" the Academy fosters. Blackwood then leaves on a tour of the school. Prudence struggles to hide her hurt feelings and maintain her composure.
Meanwhile, Hilda meets with Sister Shirley Jackson to talk about Zelda, offering her biscuits. Hilda demands to know why she conjured up the ghost of Lady Blackwood. Shirley takes a quick liking to the biscuits as Hilda reiterates her question. Shirley says that she bears a grudge against her brother Edward Spellman for dumping her in favor of the mortal Diana. She welcomes their death as just and right.
Jackson says that she rose to a senior teaching position in the House of Night and resents Zelda for supplanting her. She vows not to have a Spellman ascend over her, leading Hilda to describe her as petty and selfish. Shirley suggests that Hilda join forces with her to bring about Zelda’s downfall while gorging on more biscuits. Hilda responds that folks tend to underestimate her as meek and mild. Hilda affirms her love for her sister and warns that anyone who threatens her family "will have Heaven to pay.”"
Shirley asks if Hilda is threatening her and reveals that she has been wearing a protection that guards her from all magical attacks ever since Zelda put that earworm in her head. However, Hilda responds that she has laced the almond cookies with cyanide. Shirley Jackson chokes before breathing her last.
Back at the Academy, the Anti-Pope meets with Father Blackwood, who has proposed a summit of all the Churches of Darkness to review all their universal laws. The Anti-Pope says that his predecessor Blackwood had made a similar request prior to his death. The Anti-Pope is supportive but asks who will lead the summit. Father Blackwood volunteers to host the summit and to present his Judas Society's five tenets, which he vows will return the Churches of Night to its former glory.
Sabrina then enters the room with Ambrose. The Anti-Pope is delighted to meet Sabrina. Sabrina tells the Anti-Pope that she found a copy of her fathers manifesto. Despite Blackwood's objections, the Anti-Pope says he will retire to his chambers to consider both doctrines and to decide which is worthy enough to put before the Witches Council.
Meanwhile, Adam is having dinner with "Ms. Wardwell" and raises the subject of marriage. "Ms. Wardwell" replies that she has changed her mind and that she is not the same woman anymore. She pours him some wine and asks him to consider what a marriage is. Adam replies that it is two people declaring their love for each other for the world to celebrate. "Ms. Wardwell" responds that marriage is only a blessing for a man and is a primrose path to a woman's destruction, describing it as the obliteration of a women’s personhood.
"Ms Wardwell" declines his marriage offer. Adam tries to reassure Ms Wardwell that she is important to him and thinks that someone must have hurt her in the past or while he was gone. He vows that he will never hurt her. "Ms Wardwell" says that her former lover was cruel to her before kissing Adam.
At the Spellman household, Nick tells Sabrina to calm down. Sabrina thinks she is failing her father but Nick reassures her that she has recovered her father's manifesto for the Anti-Pope. He tells her to sit tight for the next few hours. With their aunts away at the Academy, Nick proposes that the two share the bed together.
Back at the Academy, Blackwood reassures his son Judas that the Spellmans will not prove to be their undoing. He says that they cannot risk the Anti-Pope choosing the Spellman manifesto over his own. Blackwood says he has contingencies in place and tells his son to sleep peacefully. He vows there will be blood tonight and glory in the morning.
While Adam sleeps, Lilith enters the fireplace with a jug of water. She is startled by the Dark Lord, causing her to drop her jug. The Dark Lord tells her that the temple is yet to fall and that Adam is a distraction and to get rid of him. He warns Lilith that she belongs to him and only him.
Meanwhile, Ambrose's stomach begins groaning. He tells his fellow Judas Society stalwarts that his stomach is craving. Zelda is anxious about the Dark Lord but Hilda tells her sister not to worry. Zelda says it is the greatest honor to be visited by the Dark Lord. Hilda suggests that the Dark Lord might choose not to visit. Zelda agrees but they are then started by the Dark Lord, who enters the bedroom. Hilda slips out while Zelda stands as the Dark Lord approaches her from behind.
That night, Prudence attempts to stab her father in bed. However, the two are startled by a woman's screams. Zelda demands to know who is screaming. Father Blackwood enters the Anti-Pope's chambers to find that he has been hacked to death. Blackwood strikes down two of the Judas Society stalwarts guarding him. Despite Zelda and Hilda's pleas, he tries to strike down Ambrose who manages to teleport to safety. He orders the others to find the traitor.
Meanwhile, Sabrina is caressing Nick when a bloodied Ambrose arrives with news of the Anti-Pope’s murder. Ambrose says he can't remember what happened but insists it was not him. Salem growls as they hear Father Blackwood bellowing orders to the Judas Society. Sabrina tells Nick to hide Ambrose. Father Blackwood arrives with Hilda and Zelda and demands to know if Ambrose is here. Sabrina denies seeing Ambrose but Blackwood's warlocks search the house.
Sabrina asks Zelda if she believes that her cousin murdered the Anti-Pope. Zelda says that the Anti-Pope was covered was blood and that he spirited himself to safety. Sabrina believes that Ambrose is innocent but Zelda points out that Ambrose plotted to blow up the Vatican. Father Blackwood says that they now need strong leadership and should go ahead with the wedding. Father Blackwood announces that they will hold a joint-wedding and funeral.
At Dorian's Gray Room, Dorian Gray tells the Judas Society that he has not seen Ambrose and the warlocks depart. After they have left, Dorian changes into Ambrose and tells Dorian Gray that he can come out of the painting he was hiding in. Gray says he will do anything for his friend Nick. Ambrose is sickly and serves him a drink. Ambrose vomits out his familiar Leviathan and realizes that the mouse was hiding inside him. Dorian tells Ambrose that the mouse was controlling him/ When Ambrose reveals that Leviathan was a gift from Father Blackwood, Gray deduces that Blackwood was behind the Anti Pope's murder. Gray tells Ambrose that Blackwood takes advantage of his boys. When Ambrose asks what he means, Dorian reveals that every warlock who gets close to Father Blackwood ends up dead such as Luke. Ambrose asks if Blackwood murdered Luke and Gray tells him it's very possible. Ambrose vows to kill Blackwood for murdering Luke.
While Sabrina is visiting her father's grave, Nicholas tells her that Ambrose is hiding. She tells him Luke that Father Blackwood wants to combine the wedding and funeral and vows not to let her parents’ deaths be in vain. She also resolves not to let her Aunt Zelda marry Blackwood. Sabrina proposes borrowing a page from the play Hamlet to clear Ambrose's name and derail Blackwood's plan. Nick proposes doing it with a glamour, something Shakespeare did not have.
Father Blackwood demands to know why Prudence would try to commit patricide. Realizing that her ambitions knows no bounds and that he needs the support of his family, he makes her a Blackwood. Father Blackwood officiates over the funeral of the Anti-Pope and announces he will conduct his own marriage to Zelda. Hilda accompanies Zelda down the aisle.
Blackwood offers a blood sacrifice to the demons of marriage and lust: Astaroth, Furfur, Hathor, Ishtar, Saleous, Uvall, and Vassage. He and Zelda drink the blood of a sacrificed being. Hilda sheathes Zelda and Blackwood's hands with a cloth. Blackwood reads their marriage vows.
However, the wedding is interrupted by the ghosts of Edward and Diana Spellman, who denounce Faustus Blackwood for murdering them and the Anti-Pope. Blackwood sees through Sabrina and Nick’s trick and removes their glamour. Before the Judas Society can take them away, Sabrina denounces Father Blackwood as a fraud and accuses him of murdering her father and the Anti-Pope. Ambrose tries to interrupt the wedding but Prudence magically restrains him. He is then subdued and caputred by the other Judas Society boys.
Meanwhile, Lilith is casting a spell to protect the mortals. Stolas protests but Lilith responds that what the Dark Lord knows won't hurt him. Adam returns and "Ms Wardwell" tells him to wear a ring and never to take it off. Adam does it out of his love for "Ms Wardwell."
Zelda confronts Sabrina for ruining her wedding day. She informs him that Ambrose has been locked in the Witches' Cell for his crimes. Zelda also informs Sabrina that she and Nick have been expelled from the Academy. Finally, Zelda tells Sabrina that Blackwood married her in his office. Meanwhile, Ambrose lies in his cell.
Father Blackwood announces that he and Zelda will be escorting the Anti-Pope's remains to the Vatican Necropolis. He and Zelda also plan to have a honeymoon abroad. Blackwood tasks Prudence with overseeing the Academy and protecting their family name. Prudence replies that he can rely on her. Before they leave, Blackwood reminds Zelda that a wife walks behind her husband. Sabrina and Hilda watch in dismay.