Dexter tries to trap the Brain Surgeon with Dr. Vogel's assistance.
Having made the decision that he and Harrison will move to Argentina with Hannah, Dexter has a lot to do. He tells Deb about his plan but that doesn't go over very well. He also tells Dr, Vogel that her son, Saxon, is dangerous and she is in need of protection. She insists that he back off and let her deal with him in her own way but Dexter has no intention of leaving Miami while Saxon is alive. Saxon has problems however and he takes his mother to his killing room explaining that it's identical to the treatment room at the mental hospital she put him in. He wants his mother to help him in the same way she helped Dexter. Meanwhile, Quinn suggests to Jamie that she should at least attend a job interview for a position at a prestigious academy in Atlanta. Masuka is upset when his daughter Niki shows up high at a crime scene.
Saxon brings her mother to a room in an old psychiatric hospital to show how he was treated. Meanwhile Dexter finds footages of Saxon's murders using spyware in Dr. Vogel's computer and downloads them to a flash memory. Federal Marshall Clayton tells Angel that he will not investigate Hannah anymore. However he overhears Angel on the phone and learns that Dexter is quitting the police to travel abroad and he believes that Debra might be hiding Hannah. Dexter shows the footage of her son killing Zach and she decides to help Dexter to find Daniel. Her choice leads her to a tragic end.
- Open with Vogel and Saxon having breakfast. They argue over his future, with Vogel offering to find him care. He says he will never return to full-time care and is furious at her for helping Dexter while he was "rotting" in a hospital. She offers to help him but he doesn't think he can trust her.
Dexter tells Hanna that while he thinks the investigation on her is dying down, she still needs to lay low. They are still planning to leave town with Harrison. He also says he feels like he needs to reach out to Vogel and make sure she's okay. Debra returns home and Dexter takes her aside to break the news of his planning to leave the country. She's not happy.
Quinn and Jamie have dinner. She's being recruited by a special needs academy in Atlanta but isn't going to accept because she doesn't want to leave town. He tells her to focus on her career and that they'll "make it work."
Vogel goes to see Matthews. He's at a dead-end looking for Zach Hamilton and wants some help. She doesn't say much.
Dexter researches Oliver Saxon. He's moved all over the world without being arrested and Dexter if he might be the "perfect psychopath." Dexter spots Vogel and asks her into his office. She admits to having been in contact with her son but says she isn't sure if she'll see him again. She's feeling guilty about being a bad mother and says she has to help her son. Dexter wonders what to do and Harry shows up to tell him he needs to kill Saxon.
Debra and Quinn have lunch. She tells him Dexter is leaving and says she's worried he won't return. Quinn thinks she should think about what is best for Dexter. She also says she's probably returning to Miami Metro.
Nikki shows up late to a crime scene smelling of marijuana. Masuka is furious and sends her home. Dexter gives Angel his notice and asks him to keep the news private for the moment.
Hannah tells Dexter the sooner he kills Saxon the sooner they'll be able to start their new life together. Dexter thinks he needs Vogel's computer to find him.
Saxon waits outside Vogel's place and asks to her get in his car so he can show her something.
Saxon brings Vogel to the old psychiatric hospital where he kills his victims. He's made the room look exactly like a Treatment Room from the place where he'd been held. He wants her to show him how to exist in the world while still a killer. To help him like she helped Dexter. She agrees to "find a way" and says she'll talk to Dexter.
Dexter uses Vogel's spare key to break in and use her computer to find Saxon. He's able to get onto Saxon's computer and video of his last two kills, including Zach. Dexter downloads them onto a flashdrive.
Clayton tells Angel that the Hannah investigation has been dropped to low priority. While in his office Clayton overhears Angel looking for Dexter's replacement. Clayton seems intrigued when Angel tells him that Dexter is leaving to spend time with his family.
Quinn breaks up with Jamie. She's convinced that Debra is the reason and is upset when Quinn says Debra had nothing to do with it.
Debra returns home and watches Dexter, Hannah and Harrison together. He hands her a beer and they talk about him leaving. Debra is scared.
Vogel stops by to see Dexter. When she sounds optimistic that her son can be saved he shows her video of Zach's murder. She seems to agree he must kill Saxon and instructs Dexter to make sure it's painless.
Clayton stops by to see Debra and Harrison on the beach. He tells her of his suspicions concerning Dexter and Hannah, but Debra does a good job of throwing him off the scent. He leaves and Debra goes inside to tell Hannah what happened, reminding her that she needs to stay hidden.
Debra tells Elway she's leaving. It is a short conversation.
While Hannah is watching Harrison he falls off Debra's treadmill and cuts his chin badly. She calls Dexter but he doesn't answer. Hannah takes Harrison to the ER where the desk nurse seems to be watching her carefully.
Dexter sets up his kill room with Harry watching. Dexter's is using victim pictures for the first time in awhile. He's using an old kill room and the two reflect on how far he's come.
Debra goes to the station to tell Angel she's officially coming back. Jamie yells at her when the two cross paths. Angel tells Debra that Jamie blames her from Quinn ending things.
Debra takes Quinn outside to talk things over. He says he probably would have ended things with Jamie anyway, but their kiss played a role. She tells him she still has feelings for him and then kisses him.
We see the ER nurse tell Clayton that she definitely saw Hannah. He looks down at the log book and sees she signed in as Debra Morgan.
Dexter returns home and Hannah tells him about the ER visit. He's concerned she's been exposed. Vogel calls to say Saxon's on his way over. This concerns Dexter and he tells Hannah he should go there. Dexter leaves the house but it clearly torn about whether to stay with Hannah or go to Vogel.
Vogel and Saxon share some tea and try to make small-talk. He's very aware she's scared.
Dexter pulls up to Vogel's home and gets out of his vehicle. As he walks to the door his phone rings. It's Saxon. He tells Dexter to watch the window. We see Saxon standing behind Vogel. He says "mother chose the wrong son and cuts her throat. Dexter goes inside where Vogel dies in his arms.