In the season three finale, Dexter attempts to calm the emotionally unstable Ramon now that Miguel is out of the picture. Debra is about to receive her detective's shield but is blind-sided with information that could derail her promotion.

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Dexter tries to bring Debra on-board with his new target, while the Ukrainian mob seeks revenge for the killing of one of their own. Quinn grows close to a dancer at the mob’s strip club, and LaGuerta attempts to enlist Batista to help her with re-opening the case of the Bay Harbor Butcher, who she believes is still out there. Reeling from Debra witnessing Dexter kill Travis Marshall, brother and sister attempt to reconcile while struggling to cover up their involvement with the murder. Meanwhile, Detective Mike Anderson has an unfortunate run-in, Quinn and Batista begin to make amends, and LaGuerta finds evidence that causes her to re-think the closed Bay Harbor Butcher Case, which could mean trouble for Dexter – and Debra… Dexter remains on the trail of a dangerous new victim, while the traumatized Debra loses control on the job. A high-profile FBI agent arrives in Miami to investigate a newly discovered serial killer, the Bay Harbor Butcher. Just as Dexter discovers a possible ally in the pursuit of Lumen's former captors, he and Lumen are forced to step down as Homicide uncovers some key evidence linked to one of their prior victims. Dexter is preoccupied with Isaak still on the loose, but an internal struggle within the Koshka Brotherhood could work to Dexter’s advantage. And while Miami Metro is on the hunt for a Phantom Arsonist, Dexter goes to great lengths to protect his relationship with Hannah, asking a favor of Debra that causes her to question her loyalty to Dexter.Dexter realizes that he has carelessly misplaced crucial evidence that could expose his dark side to the world, while helping to investigate new slayings that Agent Lundy insists are the work of Trinity. Dexter uses lessons he learned from Brother Sam to follow up on some new leads in the Doomsday investigation. Debra butts heads with Captain LaGuerta over the case of a dead call girl. Dexter is none too pleased to discover a copy-cat killer has started his own attempt at vigilante serial murder in Miami. He is even less pleased to learn the new killer claims to be inspired by the “Bay Harbor Butcher.”

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In the season finale, Dexter’s situation grows desperate when he discovers that Lumen has been set up. Despite knowing he’s being baited into a trap, Dexter risks everything to make sure he doesn't fall into the same mistake again. Starring: Michael C. Hall , Jennifer Carpenter , David Zayas , James Remar , C.S. Lee , Luna Lauren Velez

With the help of his newfound friend, Brother Sam, Dexter wonders if there is light within him to counter the darkness. The search for the Doomsday Killers takes Dexter in a new direction, while Batista and Quinn pay a visit to the university where Professor Gellar taught. Due to departmental regulation following the shooting, Debra is forced to begin therapy.