Vogel reveals to Dexter that she helped Harry create his Code, and asks him for help in tracking down the Brain Surgeon, whom she believes to be one of her former patients and a grave hazard to her life. Meanwhile, Debra and the hitman have a violent confrontation over the jewelry, leading her to murdering him in his car later that day. Dexter finds her blood at the crime scene, but hides it from the police. After he saves her from Quinn's questioning, Debra confesses to the murder, but asks Dexter to steal her gun that was found at the crime scene from the evidence room, which he does. Quinn and Jamie argue over Quinn's future and Batista's involvement in their relationship. Dexter tracks down one of Vogel's patients, Lyle Sussman, who he believes is the Brain Surgeon, but discovers that he has been murdered at his remote cabin. At Vogel's home, she and Dexter find a DVD from the Brain Surgeon, showing the killer talking Sussman into murdering the victim found at the beginning of the episode. Dexter agrees to track down the killer from Vogel's list of suspects, and Vogel comforts him in a motherly way.