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The police close in on the Trinity Killer, who cautions Dexter to keep away. But Dexter is willing to do whatever he can to get his man, legal or not. Meanwhile, LaGuerta and Batista must answer for their breach of ethics; and Debra becomes privy to something she’s not sure she wanted to know.

Dexter needs to buy some time to protect himself when Debra's investigation brings the department away from identifying Arthur as the Trinity Killer.

Dexter thinks he knows the ins and outs of the Trinity Killer until a 10 year old boy goes missing.

It is Thanksgiving and Dexter continues to get closer to Trinity. Rita prepares Thanksgiving dinner and Debra continues to investigate the Trinity Killer.

Dexter wonders if his father's Code is the right course and hopes to get answers while on a road trip with Trinity. Meanwhile, Debra discovers that her single-minded pursuit of Trinity has kept her from knowing the truth.

Dexter seems to have finally managed to balance work, family, and his dark passenger. But he knows the balancing act can't last. A series of murders leads the department to a prominent photographer, prompting Dexter to move him to the top of his list which doesn't sit well with Harry. But Quinn's effort to bond with Dexter poses a problem with hunting the new prey. Meanwhile, Debra returns to work and focuses on finding the Trinity Killer, which Dexter fears will put her in danger.

Dexter knows it's only a matter of time before Miami Metro discovers the Trinity Killer's latest handiwork. Therefore, he has to work doubly hard to stay one step ahead of their investigation. Meanwhile, Debra becomes frustrated when she finds herself shut out from her own case. She considers bending the rules in the name of justice, risking her career in the process. LaGuerta and Batista come to regret a major decision, and realize that by playing by the rules they may have painted themselves into a corner. And when the friction between Rita and Dexter comes to a head, Dexter gleans relationship advice from a most unlikely source.

Dexter is inspired to investigate the Trinity Killer on his own, while Debra blames herself for an event that was out of her control, and Rita realizes how little she knows her husband after discovering one of his secrets.

Dexter gets some much-needed R&R time with Rita and the kids out of town, leading to his stalking of a new victim - until he unexpectedly begins to empathize with his target, a cop that murdered her family.

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Dexter misplaces needed evidence in the Trinity Killer case, evidence which could expose his secret. Meanwhile, Miami Metro must juggle two serial killers at the same time, as the Vacation Murders might bring the city's tourism industry to a grinding halt.

Dexter has to fit the newborn baby into his complex life. An old serial killer returns to Miami, and Frank Lundy returns to close the case.

Dexter's focus shifts to calming his emotionally unstable brother, Ramon, now that Miguel out of the picture. Now tha Ramon has calmed down, Dexter feels he can breathe once again. All that is left now is his upcoming marriage to Rita, until another deadly surprise shows it's ugly head. Meanwhile, Batista informs Debra that she is going to received her Detective's shield, but is instantly blindsided when she receives information which may end her promotion.

Dexter has hard times distancing himself from Miguel, after all he's still Dexter's Best Man. Rita has her own dilemma now that she knows Miguel's been seeing another woman.

Dexter feels like he’s making a deal with the devil when he feigns civility around Miguel after his duplicitous ways. Dexter finds himself in a series of chess-like moves against his former friend, all while hoping that Miguel doesn’t get the upper hand on him. Meanwhile, Dexter watches helplessly as Miguel draws Rita closer through a wonderful wedding gift. Debra, now back with Anton after his close call with the Skinner, wonders if her relationship with Anton is worth putting her career in jeopardy. After all, is it smart for everyone to know that she is dating a former confidential informant?

Miguel and Dexter's friendship is impacted when Rita confronts Miguel about his alleged infidelity. Believing Skinner has abducted Anton, Debra pulls out all the stops to find him.

Miguel brings Dexter another "project," but this time he wants to get his hands dirty. Dexter realizes it's time to teach Miguel the Code - for his own safety as well as Miguel's. As Dexter walks Miguel through the process, Dexter both struggles with, and enjoys, letting Miguel into his private world so completely. But Dexter doesn't realize that this has only whetted Miguel's appetite. Rita finds herself losing control because of the pregnancy. She becomes worried that Dexter may get fed up with her. Because of her hard work, Debra finds herself one step closer to catching the Skinner. But after she finds out a secret about her new boyfriend, Anton, he disappears on her.

Miguel finds a new target for Dexter. Dexter is asked to do the unthinkable for an old friend. Rita learns Miguel's wife believes Miguel is being unfaithful.

Miguel is put to the test by Dexter. Rita is forced to reconsider her choices. Debra begins to feel like she had some part to play in a homicide case she's working on.

Rita wants Dexter to move in with her and the kids. Miguel gives Dexter his next mission to find the culprit who murdered his two wives for money.

After a failed marriage proposal, Dexter attempts to convince Rita that he wants more than a financial merger and fatherhood. He wants a family with Rita. Deb lands a new case. Miguel's brother, Ramon, is dead set on finding Oscar's murderer, which worries Dexter and Miguel.

Dexter and a pedophile have a run-in; Dexter is unable to restore Freebo's good name after he is accused of a murder he didn't commit. Also, Dexter's friendship with Miguel weighs on his mind.

Debra and the homicide unit, Dexter and ADA Miguel Prado are all searching for the same serial killer, who is responsible for the death of Prado's younger brother. Meanwhile at home, Dexter is faced with a decision to make concerning Rita and her kids.

Dexter continues to live his life according to his newly revised code. Deb is asked to help IA by investigating another officer. Batista is promoted to Sergeant ( Doake's old title). While trying to apprehend a new victim, Dex stumbles upon someone not in the plan. After an altercation, Dex is forced to kill the unknown man. Immediately after, the unknown man is recognized as the ADA's brother. The ADA, Miguel Prado (Jimmy Smits), invites Dex to his slain brother's wake. Dex blows off Deb for their annual celebration of Harry's birthday. Rita tells Dex she is pregnant.

Dexter starts to fear that Miguel may have strayed from the newly taught Code. This concern starts to put a strain on their friendship. And Dexter doesn't get a reprieve from this at Rita’s either. Sylvia, noting how Miguel is never at home anymore, tells Rita that she is now convinced that Miguel is having an affair. Rita decides to confront Miguel about his indiscretions. Meanwhile, Anton is confirmed to have been taken by the Skinner, sending Debra into a furious search, not only for Anton, but also for his potential killer

The Bay Harbor Butcher case is closed, but Dexter continues to deal with his issues with Lila and Doakes.

Dexter begins to dodge bullets, both figurative and literally. Now, Dexter must decide his own fate, as well as those he cares about most. Lila tries to blackmail Dexter into becoming her lover, but makes a discovery that changes their lives forever.

Dexter gains the upper hand when Doakes follows him to his latest kill. But when Doakes reveals a secret about Harry, Dexter's world falls apart. Meanwhile, Rita begins to let Dexter back into her life and the Miami PD narrows in on the Bay Harbor Butcher.

As Dexter tries to break away from Lila, he finds that she's not ready to let him loose. Meanwhile, Lundy's search for the Bay Harbor Butcher continues, making Dexter nervous. However, Dexter's worst enemy discovers his secret.

After there is a fire at Lila's house, Dexter finds that she has become more attached to him than he's comfortable with. Meanwhile, when "recovery" doesn't work for the man who killed his mother, Dexter pays the man a visit. At the station, Deb and Lundy find a clue that makes them suspicious that the Bay Harbor Butcher might be closer to them than they think.

The Bay Harbor Butcher sends the Special Task Force a written letter, making them all on edge. Continuing with his plan, Dexter tries to be more "pro-active" in keeping Lundy away from him, but things become complicated when Lila begins to take a toll on Dexter's personal life.

A copy-cat killer inspired by the Bay Harbor Butcher begins to stalk Miami criminals, much to Dexter's chagrin. As Dexter tries to stop the fake, he tries to recover a video that might expose him for who he really is.

Dexter learns that one of the men who killed his mother is still alive, and decides to confront him with Lila so that his addiction does not get the best of him.

While pretending to be a drug addict, Dexter gets an N.A. sponsor to please Rita. But when the sponsor turns out to be a beautiful woman who may have more in common with Dexter, Rita is not happy. Things get worse for Rita when her estranged mother comes for a visit. Meanwhile, Dexter must find a way to lead the all-too-smart FBI Agent Lundy, now working with Miami Metro PD, off his trail.

Dexter's sudden inability to deceive has him pursuing a slick liar as his next victim, while Rita believes he's concealing a drug problem and forces him into a 12-step program where he meets Lila, a seductive new woman.

The discovery of the dumping ground off the coast brings in a renowned FBI agent for solving practically impossible cases. Dexter continues to struggle but finally comes to terms with the death of his brother. Dexter reveals to Rita the truth about Paul's return to the prison system.

Dexter finds himself not "on his game" after the death of his brother, the ice truck killer. He fails and shows mercy and then fails to prepare his victim after that. In the meantime his sister returns to work even though she still has some signs of mental trauma from her brush with death. A dramatic find at sea by treasure hunters triggers different feelings from himself and his sister.