Dexter is a forensic expert in blood patterns who works with the Miami Police Department. He is also a serial killer, who kills people that the police can't bring to justice. He has to hide his double life from his sister, his girlfriend and his co-workers. He is intrigued by a killer who has found a way to kill girls without leaving blood behind.
While the rest of the police department are focused on finding the Ice Truck Killer, Dexter is busy gathering evidence for his next victim. It turns out he will also discover more about relationships, love and how to make a success of it all. In doing so he gets some hilarious advice from unlikely sources and we see the first time that he actually kills two people at one time.
Jim Conley, the forensics supervisor of the Anaheim Police, tells the story of a murder investigation in which his knowledge of blood spatter was crucial.
Dexter sets his sights on a new victim: a murderer so repulsive it seems only fitting that he's a used-car salesman. Dexter's been unable to lie to Rita about his midnight activities, which has her thinking that he's a drug addict. She's threatened to leave him if he doesn't commit to a 12-step program to deal with his supposed addiction. While in this recovery, though, Dexter meets a sexy, mysterious woman named Lila.
Watch episode one of the new online series The Dark Defender. The Dark Defender rids Miami of a notorious gang lord. Stalker of the night, his blade of vengeance turns wrong into right.
Watch episode two of the new online series The Dark Defender. The Dark Defender kills a murderous car dealer. Stalker of the night, his blade of vengeance turns wrong into right.
Dexter continues the hunt for Freebo, knowing he is still in town after finding Teegan's body. Dexter and Rita must make a decision about her pregnancy. Dexter isn't sure whether he can raise a child. Deb searches for the identity of her body, not knowing the link to the Freebo case. Dexter races to beat the rest of the police to Freebo.
While Dexter struggles with how to handle Rita’s desire for them to move in together before they get married, Miguel tells Dexter about a husband who has gotten away with killing two of his wives for financial gain. Meanwhile, Debra works with Anton, her confidential informant, to track down one of Freebo’s criminal confidants.
While preparing for his big wedding day, Dexter has to figure out a way to remove Miguel from his life for good. In the meantime, Rita has troubles of her own, when Syl reveals that Miguel has been seeing one of his old flames. Debra finds a new clue that brings her even closer to catching the Skinner.
The pressures of fatherhood threaten to bring Dexter's world crashing down. In his carelessness, Dexter realizes that he's misplaced crucial evidence, something that could expose his dark side to the world. But his search will have to wait, as Miami Metro's two simultaneous murder cases continue to escalate. Their top priority is to solve 'The Vacation Murders', a series of robberies gone bad that threaten Miami's lucrative tourist industry. Lundy, however, remains convinced that the bigger problem is dealing with the Trinity Killer, who unbeknownst to them is already stalking his next victim. Dexter has to weave a web of lies to extract himself from his duties, hoping to bury his secret before someone else finds it first.
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. Dexter has begun to realize that the closer he gets to Trinity, the more he stands to learn from this very different beast.
Dexter finds himself enjoying a brief moment of tranquility. He's finally managed to strike a balance between work, family and other pursuits. But he's keenly aware that times like these aren't meant to last. When Miami Metro discovers a string of murders connected to a prominent photographer, Dexter sees an opportunity for a clean kill.
Dexter has always known his father’s Code was meant to protect him from exposure. But after committing a serious mistake, he wonders if it could have been designed to protect him from something even more dangerous – human emotion. When he discovers that Trinity is planning an out-of-town trip, Dexter sees an opportunity to ride along and gain insight into the mind of a fellow monster.
Miami Metro is just one step away from discovering the identity of the Trinity Killer. And Dexter can't let that happen. Dexter must take drastic action to buy himself time to deal with Trinity in his own fashion. Arthur, who still can't understand why Dexter didn't simply turn him in, begins his own bloody investigation into Kyle Butler.
Dexter's situation grows desperate when he discovers that Lumen's 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. In the Barrel Girls case, Debra lets her personal feelings lead her instincts once she concludes that vigilantes are more than just a theory. Quinn finds himself in a troublesome situation, which only Dexter can help him out of.
Dexter shows up at his 20th high-school reunion with the intention of confronting the former prom king. Elsewhere, an investigation into a heinous murder with religious overtones leads Dexter to ponder spiritual matters and wonder about his son's legacy. And an unexpected situation results in Debra becoming a hero.
Dexter is confronted with a sobering glimpse of his own potential future when a serial killer from his past makes a startling reappearance; Debra is uncomfortable in her new job; Travis struggles to keep his mentor happy, as he and Gellar prepare a new twisted tableau, ensuring Debra's next task will be a daunting one.
Much to his own surprise, an emergency with Harrison and a new tableau from Gellar and Travis has Dexter leaning on Brother Sam and an unexpected winged messenger for support as he questions the idea of faith; with proof of a religiously motivated killer, Homicide hunts for a zealot, with Debra giving her first official press conference.
With the help of his newfound friend Brother Sam, Dexter wonders if there is light within him to counter the darkness, while the search for the Doomsday Killers takes him in a new direction; Batista and Quinn pay a visit to the university where Professor Gellar taught; due to departmental regulations following the shooting, Debra is forced to begin therapy.
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 their strip club. LaGuerta, convinced the Bay Harbor Butcher is still out there, attempts to enlist Batista to help her re-open the case.
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.
DARK ECHO tells a story in which Dexter is challenged by a copy-cat killer who does not follow any sort of code. Dark Echo opens immediately after the death of Dexter's father, Harry, with Dexter in his early twenties and his sister Debra still in high school. Dexter is enrolled in medical school where he's studying anatomy to improve his "craft." During a routine kill, Dexter realizes that another student has been spying on him and knows that he is a serial killer. He confronts the student after he begins to commit murders in Dexter's style and the two clash over the ethics of their situations.