It's five years ago, and we see the familiar sight of Ariel Peterson sick on the side of the road. Officer Vaughn pulls up and offers her a ride. After some awkward tension, Vaughn stops the car and forces himself on her. She pleads and cries, and he knocks her out cold.
In the present, Ariel lies next to Vaughn in bed inside the basement prison he keeps her in. She tells him that they could have a real life outside with their son, Jake, but he refuses to hear it and leaves.
Sarah reads the story about Alison's death in the Bulletin, and Dylan makes a tasteless comment about her death. Sarah says things have been working out awfully well for Dylan with all of the murders going on, and he leaves offended by her comment.
Sarah tells Cam that she found out Marjorie Travers, a local prostitute, claimed to see Ariel on the night she went missing, but it was impossible for Ariel to be there at the time Marjorie suggested. They confront her but she refuses to budge. Something's fishy with her story…
Vaughn returns to unpack groceries, and Ariel makes an attempt to escape with Jake. They make it upstairs, but the door is locked. Vaughn manages to get a hold of Jake and threatens to choke him to death, and Ariel gives up. They retreat back into the basement, but not before encountering Vaughn's wife, Nancy, who simply turns a blind eye.
Sarah returns to the prison and confronts Tom. She says there's no way he could be her father, but Tom says he's certain it's true.
Later, Tom is taunted by another inmate who steals his Bible. Tom retaliates by attacking him, but the other guy gains the upper hand and knocks Tom down and stomps on him.
Cam informs Vaughn about the weaknesses in Marjorie's story, and Vaughn goes to visit Marjorie at her hotel room. She says she'll say whatever he wants her to say for him, and he gives her a syringe filled with heroin. Marjorie overdoses, unaware that Vaughn is a desperate man trying to tie up his loose ends.
Sarah goes to investigate the spot where Ariel went missing when Vaughn pulls up in his car. He offers to give her a ride. Sarah shares with him the myriad of inconsistencies in the case, slowly coming to the conclusion that all of the evidence seems to point to a cover-up by Vaughn.
Realizing her mistake, Sarah tries to escape the car, but Vaughn reveals she's dead on with her assumptions and forces her to toss her phone out of the car. He drives her to a junkyard.
Vaughn tells her he's going to make her death look like the work of the Executioner. The punishment for pride is being broken over a wheel. Once they arrive at the junkyard, he pulls her out of the car and throws her onto a tire and starts to beat her.
Sarah screams for help and Vaughn attempts to quiet her down, but she bites his hand and manages to escape. She races through the woods and flags down a driver passing by, who picks her up just as Vaughn finds her.
Vaughn returns to Ariel and Jake in the basement and purs gasoline all over the room. He's about to light the place on fire, but Ariel begs him to stop.
Cam and Sarah arrive at Vaughn's house and Sarah convinces Nancy to let them in. They go downstairs just as Ariel and Jake are walking out of their room. Vaughn is nowhere to be found. Heather arrives at the house and embraces her daughter for the first time in years. Sniff...
Sarah visits Tom at the prison infirmary and says she can accept that he may be her father, but she wants to know why he killed her mother and her husband all of those years ago.
Meanwhile, Vaughn attempts to escape. He takes a motorboat to a cabin in the woods, but his plans are foiled when the Executioner appears in the doorway and knocks him out.
Vaughn wakes up in a coffin, just as the incinerator is turned on. The punishment for lust? Being burned alive.