Later, Stefan informs Damon that Isobel has arrived and explains that he's going to find out what's happening. Katherine appears and tells them not to tell Isobel that she's in town. Damon and Stefan don't know whether to trust her, but Katherine points out that she wants Klaus dead too. She adds that they might need her to swap places with Elena again. Stefan tells Damon to let Alaric know about Isobel and leaves. When Alaric finds out, he heads straight to the Gilbert house but Elena admits that Jenna won't talk to her. Jenna appears but is furious and announces that she is going to stay on campus for a while. She asks Elena to pick up a cheque for her mother's foundation at the Lockwood luncheon but refuses to speak to her or Alaric and leaves. John appears and says Alaric should have been more honest with Jenna. However, Alaric punches him and leaves. When John recovers, Elena tells him that this is all his fault.
Caroline calls Stefan and admits that she can't find Matt, who is freaking out because she is a vampire. Stefan advises her to find him and calm him down, compelling him if necessary. Stefan tells Elena about the situation, but as she worries John appears and asks the pair to come downstairs. When they go, Elena is furious to discover that John has invited Isobel inside. However, John explains that Isobel has information about Klaus. Isobel explains that she has been trying to find Klaus to keep Elena safe, while John says that they killed all of the tomb vampires so that Klaus would not find out that Katherine is still alive and trace Elena. Isobel claims that there are rumours flying around that there is a doppelganger and John says that vampires will be queuing up to trap Elena and win favour with Klaus. Isobel says she has a safe house for Elena, but Elena refuses to go and tells Isobel to leave.
Meanwhile, Damon, Jeremy and Bonnie go over to the Martins' house where they discover Luka's body. Bonnie tells them to pack up the Martins' Grimoires and explains that when Jonas gave her back her powers, he told her to find the spot where the witches were burned and harness the energy to use when she needs it. Damon reveals that he knows where the witches were burned and Bonnie uses her powers to find the Grimoire with the right spell. Elsewhere, Isobel returns to the house she has taken over and discovers Katherine waiting for her. They hug, and Isobel reveals that she has been making a deal with Klaus to save Katherine's life. She says that John thinks she is helping to protect Elena so has been keeping her informed. She admits that she didn't find Klaus but met a witch in his inner circle. She says that Klaus will give Katherine her freedom if they deliver the moonstone and doppelganger. Katherine promises to get the moonstone and says that she is happy to betray Damon and Stefan if it means keeping herself safe. At the Salvatore house, Stefan admits that he doesn't trust Isobel but thinks they should heed her warning that the rumour of a doppelganger is out there. Damon suggests that he and Stefan should stay with Elena at all times. Stefan agrees to go with Elena to the Lockwood luncheon, but Damon says he has to help out Bonnie. However, when Katherine appears he refuses to say anything else. Katherine says she has been honest with them and asks where the moonstone is, but Damon will not tell her. He adds that he still doesn't trust Katherine.
At the Lockwood house, Sheriff Forbes tells Carol that they can't figure out what started the fire at the Martin house but explains that she thinks vampires are responsible. Caroline arrives and asks after Matt, but Carol admits that she doesn't know where he is. She asks Caroline to ask after Tyler if she does find Matt. Caroline spots Elena and Stefan arrive and tells them that she hasn't found Matt yet, worrying that he will tell everybody about her. Elena promises to help out once she's picked up the cheque and Caroline rushes off.
Jeremy, Damon and Bonnie arrive at the house where the witches were burned. However, Damon soon discovers that the witches don't want him there as they burn him and stop him from moving. Bonnie counteracts the spells and Damon goes to wait outside. Later, Jeremy admits that he is worried about Bonnie but she kisses him and tells him she's sure she wants to do this. As she casts the spell, she hears the witches chanting something. She walks off into another room and Jeremy follows anxiously. Some candles light themselves and Bonnie explains the witches are ready. Soon, she is screaming and crying. Jeremy is shocked but suddenly everything is quiet again and Bonnie reveals that she has done it.
Meanwhile, Katherine searches the Salvatore house for the moonstone. Noticing that her hands are dirty, she goes to wash them - and finds the moonstone hidden in the soap bowl. Elsewhere, Isobel approaches Alaric and reveals that she compelled him to let her go. She insists that she loved him. However, she ends: "He's all yours." She walks away, crying, as a witch appears behind Alaric and overpowers him. Back at the Lockwood house, Elena gets up to accept the cheque. Upstairs, John is shocked to see Isobel. She says she is creating a distraction and bites him. As Elena gives her speech, Stefan notices that John has been pushed down the stairs. He rushes over, followed by the other guests. Elena is left in the room alone and is approached by Katherine, who covers Elena's mouth and steals her dress. Stefan returns looking for Elena and discovers Katherine - disguised as Elena - on the phone calling Damon. The real Elena has been kidnapped by Isobel, who is driving away. Katherine and Stefan rush outside but Stefan knows he is not with Elena and pushes Katherine against the car, asking where Elena is. However, Katherine injects him with something and throws him into a bush. Later, Damon arrives at the Lockwood house and reveals that John will come back to life because of his ring. Carol and Sheriff Forbes are shocked but appear to agree to come up with a cover story. Sheriff Forbes leaves and discovers Matt waiting for her. He shouts that he wants to see Vicky's file so he can find out how she was killed by vampires. Sheriff Forbes grabs him and tells him to calm down. Meanwhile, Damon takes John home and decides to go and wash his hands as they are covered in blood. He receives a phone call - Stefan explaining the situation. He quickly searches through the soap bowl and discovers that the moonstone is missing. Elsewhere, Isobel calls Katherine, who reveals that she is at Isobel's house. She says Isobel will need to hurry. Katherine asks how far she is and Isobel apologises, saying she had to do what she was told. She explains that "he" wanted the moonstone and wanted Katherine. Suddenly, Katherine spots that the witch who overpowered Alaric is in the room. He uses a spell and she falls to the ground screaming and clutching her head.
Caroline calls Matt again, but is shocked to discover him waiting in her house. Matt explains that Sheriff Forbes brought him her to calm down after he accused her of covering up Vicky's death. He says he didn't tell her anything about Caroline. However, he appears scared of her. He explains that he stayed because he wants to know more about Vicky and Caroline. Caroline promises to fill him in and tells him everything. Afterwards, Matt is devastated that he is alone as all his friends are liars. Caroline insists she is still the same person but Matt refuses to touch her, saying he knows too much now. He asks her to help him forget and Caroline is reluctant. However, she eventually agrees to compel him to forget. Afterwards, Matt goes to see Sheriff Forbes and reveals that he drank the vervain and got Caroline to tell him everything. Sheriff Forbes thanks him and says she is glad Matt told her what happened. Crying, she asks him to tell her everything Caroline said. Matt admits that he feels like Caroline died and Sheriff Forbes says she did.
Meanwhile, Jeremy and Bonnie leave the witches' death spot. Jeremy asks what the chant was and Bonnie admits that it was a warning. She claims the witches were telling her to be careful with her new power. Jeremy asks how much power the dead witches gave her and is impressed when she makes the leaves fly around, the sky darken, and lightning flash. However, he is furious when he later discovers that if Bonnie uses too much power it will kill her. He asks how much power she needs to kill an original and Bonnie admits that she needs all of it. Jeremy refuses to let her do it and says Elena would not let Bonnie sacrifice herself. However, Bonnie claims that she was called to do this and urges him not to tell Elena. She says she is the only one who can stop this and it is her decision.
Later, Elena returns to the Salvatore house and admits that she never thought she would care about Isobel's death. She asks why she was set free and Stefan suggests that Klaus knows she won't turn into a vampire and won't run away. Damon arrives with the deed to the Salvatore house and suggests that Elena should take it so that she can use it as a safe house and control who comes in. John suddenly wakes up and immediately apologises, saying he had no idea what Isobel would do. Elena agrees to speak to him and John explains that he never realised Isobel was working against him. He explains that he saw how heartbroken she was to give up Elena when she was a baby and points out that Isobel was the first girl he ever loved, and that's why he trusted her. He says he will do whatever Elena wants now and offers to leave. However, Elena says that although he screws everything up he is the only parent she has left. "Maybe I can learn not to hate you," she says. Meanwhile, Damon tells Stefan that Bonnie's spell worked and she's ready to go. Stefan points out that Katherine doesn't know Bonnie got her powers back and Isobel has no idea what Bonnie has done. Damon realises that Bonnie is their secret weapon.
The episode ends with Katherine waking up in a room. She sees the witch who kidnapped her casting a spell over a man in a chair. She spots a carafe of blood and a rope. Suddenly, she realises that Alaric is the one being enchanted. She rushes to leave but can't get out of the room. Alaric stands up but says something in a foreign tongue. He tells Katherine: "I've missed you." Katherine realises that Alaric is being channeled by Klaus.
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