"Monkey in a Box" begins with Dexter washing his hands and erasing any evidence that he was ever at Vogel's. Miami Metro arrives and they question Dexter, who is assumed to have made the call when he stopped by and made the discovery.
In another scene, Saxon is in the interrogation room, as Quinn is questioning him for further evidence in Cassidy's murder. Dexter collects a DNA sample from him.
Debra is working again at Miami Metro. She decided to return immediately to help catch Saxon and bring justice to Dr. Vogel. The Marshall stops by Debra's office to question her about Hannah and how a nurse recognized Hannah. Debra tells him that Harrison and Dexter have both been staying with her. Deb goes on to say that she's the one who took Harrison to the doctor and told the nurse she is his aunt.
After Vogel's funeral, the police force gather at Angel's restaurant for a drink and due to it being Dexter's last day at work. Quinn approaches Dexter and they discuss Quinn and Debra. Dex says he is happy that his sister is with someone she cares about, because he doesn't want her to be alone after he leaves. Angel then says his goodbye to Dexter.
Dex heads back to his apartment, only to find Saxon there with a Realtor, pretending to be wanting to buy the condo. He offers Dexter the option of forgetting about each other and letting their issues go, moving on with their lives. Saxon says he has nothing to lose, but Dexter does. Dexter smiles and agrees to back off.
Meanwhile, Elway stops by Deb's place, he suspects that Hannah is there. After he leaves, Hannah and Deb call Dexter, knowing they have to speed things up and leave before he returns.
Dexter talks to Harry, he tells him that his urge to kill is gone. Dex says that all he feels that he needs is Hannah in his life.
Debra stops by, she tells Dex that Quinn got Saxon's DNA results back and Saxon is being searched for by the entire police force. Dex asks Deb to leave because he is expecting Saxon to stop by. Debra refuses and they have dinner and a beer together, and talk about all of the events that led up to this.
Pretending to be asleep, Dexter waits for Saxon to strike. As he does, Debra appears and injects him. Once in the kill room though, Dexter can't find it in himself to kill him. Instead, he calls Debra. She arrives and Dex tells her that he wants Saxon arrested. Debra calls the police for backup as Dexter leaves to pack.
The Marshall arrives and unknowingly unties Saxon. Saxon stabs him in the chest. Debra walks in and is shot.
"Dexter" Season 8, episode 12 the finale "Remember the Monsters?," will premiere on Showtime Sunday, September 22. If you can’t wait for the next episode, make sure to like us on Facebook and follow us on Twitter to see the latest spoilers and “Dexter” news on your newsfeed!
Check out all of the previously revealed synopses and spoilers below: