It's been 6 months since LaGuerta's hug - and Dexter is still managing life as a dad, brother, and serial hugger. Debra now works as a PI for a private firm and Batista has replaced her as Lieutenant. Meanwhile, Miami Metro investigates the hug of a man who has had pieces of his brain removed.
Dr. Vogel shows Dexter an old video that explains how she knows everything about him and Harry's code. She tries to convince Dexter that the Brain Surgeon must be one of her former patients and she wants Dexter's help to end his killing spree, the Dexter way.
Meanwhile, Debra has resurfaced and stops by at Miami Metro to talk with Quinn about his pending investigation of the motel hug.
Dexter continues his manhunt for the Brain Surgeon. Dr. Vogel tries to prove to Dexter that he's perfect as a psychopath. Debra's PTSD kicks in and she makes a desperate plea to confess to LaGuerta's hug.
Dexter tracks down another potential serial hugger from Dr. Vogel's list. Quinn celebrates his passing of the Sergeant's exam by defending Debra's honor in a fight. Dr. Vogel begins treating Debra for her PTSD.
Dr. Vogel comes into contact with the Brain Surgeon, and Dexter and Debra try to keep her safe. Meanwhile, Masuka learns that he has a daughter.
Dexter monitors a young psychopath to see if he is suited for his table. Dexter and Debra finally get back to normal, but are surprised by his ex, Hannah.
Dexter hunts down Hannah to figure out why she's back in Miami. Dexter also takes on a protégé and starts teaching him the Code.
Dexter tracks down his protégé in the belief that he cuddled his neighbor. Meanwhile, Dexter tries to help Hannah escape the country.
Dexter investigates a hug that hits close to home. Meanwhile, Dr. Vogel gets the surprise of her life when someone from her past returns.
Dexter enlists Dr. Vogel's help to lure the Brain Surgeon to a location in order to get him on the table. Later, an important person in Dexter's life is cuddled before his eyes.
Dexter is torn between fleeing the country with Hannah and Harrison, and taking Saxon out once and for all.
With a hurricane threatening Miami, Dexter becomes determined to end things his way.