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It’s been 6 months since LaGuerta’s murder – and Dexter is still managing life as a dad, brother, and serial killer. Debra now works as a PI for a private firm and Batista has replaced her as Lieutenant. Meanwhile, Miami Metro investigates the murder of a man who has had pieces of his brain removed.

Miami Metro continues their hunt for The Brain Surgeon, while Dr. Vogel enlists Dexter's help. Debra continues to track down her PI case and has to take matters into her own hands.

Dexter continues his manhunt for The Brain Surgeon. Dr. Vogel tries to prove to Dexter that he’s perfect as a psychopath. While Debra’s PTSD kicks in and her guilt from the past begins to creep up.

Dexter tracks down another potential serial killer 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. So Dexter and Debra come together to try and keep her safe.

Dexter monitors a troubled young man. Dexter and Debra finally get back to normal.

Dexter and Debra’s newly healed relationship is threatened. Dex adjusts to being a mentor.

Dexter tracks down his protégé in the belief that he murdered an innocent person. Meanwhile, Dexter tries to help Hannah escape the country.

Dexter investigates a murder that hits close to home. Meanwhile, Dr. Vogel gets the surprise of her life when someone from her past returns.

With Dr. Vogel's help, Dexter tries to lure The Brain Surgeon to a location in order to get him on the table. In the meanwhile, Dexter witnesses a murder.

Dexter is torn between fleeing the country with Hannah and Harrison or taking Saxon out for good. Dexter's inaction results in a grisly and unexpected consequence.

As a deadly hurricane closes in, Dexter must make a life-altering decision to protect those he loves.