Will a months-old murder help Lisbon collar the elusive Tommy Volker? The CBI team investigates the death of a geologist – a murder, which Lisbon is convinced is the key to bringing down multimillionaire Volker.
Kevin invites Jackie for a midnight rendezvous, where he plans to surprise her with a new diamond ring. She promises to be there. O'Hara asks Jackie to help her admit her mother, who is being flown in from London. Jackie promises to be there. The movie critic wakes up – his taste in movies has been altered (suddenly, he loves "Showgirls"). After spending the day drinking at Kevin's bar, Eddie makes a scene at All Saints, threatening to tell everything.
As LaGuerta closes in on Dexter's secret, Dexter struggles to protect himself, Debra, and the life he's built, in this disturbing season finale.
As Christmas approaches, Dexter tries to balance his life with Hannah and his relationship with Debra, but unbeknownst to Dexter, Debra follows up on what could be an incriminating tip that Hannah’s father gave her. However, when Dexter learns that the man responsible for ordering his mother’s death has been released from prison, he zeros in for a kill that might end all kills.
Miami Metro continues their hunt for the Brain Surgeon, while Dr. Vogel enlists Dexter to do her bidding based on her own personal experience with her previous patients. Debra continues to track down her PI case and has to take matters into her own hands.
