With a new wife and a newer baby, Dexter is not getting much sleep these days. Baby Harrison cries all night; and Rita robs him of a rare chance to knit up the raveled sleeve of care by preparing a night of sex play. Dexter's sleep deprivation puts his work in jeopardy. He goes to court with the wrong notes, and his screw-up sends a killer free. But maybe that's for the best. His Dark Passenger is calling, and this killer is now available for Dexter to hunt. The trouble is, will the hunter be able to stay awake? Meanwhile: Angel and Maria labor to conceal their new relationship. Debra is shocked to see Lundy back in town. The Trinity Killer claims a new victim. Written by J. Spurlin

Dexter wakes up in his totaled car and quickly remembers: Benny Gomez. The guy he killed. The guy whose body parts he has not gotten rid of. The paramedics whisk him away against his will; but soon Dexter is out of the hospital (against the doctor's orders) and out looking for the body parts. They aren't in the car. They aren't at the crash site. He must have stashed them somewhere until he could find them later. Unfortunately, his lack of sleep has deprived him of a key memory. Where did he put the body parts? A vision of Harry tries to help him remember, but work pulls him away from his urgent search. The department is trying to catch the Vacation Killer, who has just struck a second time. Meanwhile, the Trinity Killer is still on the loose, and Lundy joins Debra as she interrogates her prime suspect. Written by J. Spurlin

Dexter is facing some marriage and parenting challenges. Rita is smothering him somewhat after the accident and is not allowing him to drive, as per the doctor's orders. Step-daughter Astor is growing up and everything Dexter does seems to be the wrong thing. The neighborhood watch committee goes into action when someone vandalizes property. Dexter soon has a bead on the likely culprit and decides to put his own skills to work. The Trinity Killer strikes again but Debra and ex-Agent Lundy are the only ones who seem to think the death is part of the serial killer's work. Spending a lot of time with Lundy may not be good for her relationship Anton, however. Still worried about what Dexter saw, Joey Quinn continues to try and make nice. He's also still feeding information to the journalist he's sleeping with. Written by garykmcd

With Rita away with the kids away attending a cousin's wedding, Dexter finally has the freedom to find another victim. He focuses on Zoey Kruger, a police officer whose husband and child were killed in a house invasion. The blood evidence suggests that she may have actually planted evidence to incriminate a known thief and was in fact responsible herself for the killing. She hears of Dexter's investigation and warns him off in no uncertain terms, but he decides to go ahead anyway. Debra is spending more and more time with ex-Agent Frank Lundy and helping in his pursuit of the Trinity killer. Her boyfriend Anton has noticed but she assures him he has nothing to worry about. Unexpected events forces Debra to re-evaluate her relationships. The Trinity Killer realizes that Lundy may be on to him. Det. Quinn is still sleeping with reporter Christine Hill but she may have stepped over the line with her latest story. Laguerta and Angel Batista argue whether they should inform their superiors... Written by garykmcd

With Debra recovering in the hospital, Dexter re-doubles his efforts to locate the Trinity Killer. Knowing that he is following the same pattern as his murders from 30 years ago, Dexter is sure he knows where he will strike next. Afterward, he follows the serial killer to his home and is shocked by what he finds. Dexter also has some explaining to do when Rita finds out that he never gave up his apartment and still keeps some of his possessions there. Sgt. Batista plants a news item about the suspected Vacation Murderer that bears fruit. Having told her superiors of her relationship with Batista, the Deputy Chief delivers some bad news to Laguerta. Written by garykmcd

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. Trinity hides behind a well-kept mask, and getting behind that facade will require some extra prodding on Dexter's part. 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. Written by Showtime Publicity

Dexter is resting with his family in his boat not worried about the Trinity Killer that has completed his cycle of murders. Out of the blue, he is summoned by Miami Metro to analyze an arm that has been found in the stomach of an alligator. He discovers that it belonged to the illegal waitress and aspirant model Estrella Carazo that has vanished. After the investigation Sergeant Batista finds that the photographer Jonathan Farrow is the prime suspect, but he gets no search warrant to check Farrow's studio. Farrow jumps to the top of Dexter's list and he breaks in the studio during the night seeking evidences to connect Carazo with Farrow. Meanwhile, Debra moves to Dexter's apartment and becomes disappointed with her father after interviewing his former criminal informant Valerie Hodges, and she gives up to investigate the truth about Harry Morgan interviewing other CIs. Dexter destroys the file of his mother since some secrets should not be found out. Written by Claudio Carvalho, Rio de Janeiro, Brazil

Dexter is uncomfortable for having killed an innocent. He visits Arthur Mitchell and his family and learns that Trinity is planning to travel to Tampa. Dexter plots a scheme to travel to a Convention of Meteorology in Tampa to kill the serial-killer. He forces Trinity to give a ride to him and they travel together. Dexter tells Trinity that he had killed a man by mistake in a hunting accident. Trinity brings Dexter to the house where he lived when he was a child and he accidentally killed his sister in the bathroom and Dexter concludes that this was the place where it all started. Meanwhile, in the Miami Metro, Debra shows cases of bludgeoning and convinces Lieutenant Maria La Guerta to chase The Trinity Killer. They decide to collect DNA from people that match the killer's profile expecting to find the serial-killer. Written by Claudio Carvalho, Rio de Janeiro, Brazil

Dexter stops by Arthur's house for a visit and realizes that though Arthur is in appearance the happy family man, he is in fact terrorizing his family. According to Arthur's son Jonah, they are all regularly beaten. Jonah is afraid to confront his father and invites Dexter for Thanksgiving dinner. The confrontation between Arthur and his family forces Dexter to take action. While Dexter is away for lunch with the Mitchells, neighbor Elliot kisses Rita and she clearly lets him, though she immediately regrets it. Meanwhile, LaGuerta and Batista finally admit to what has been obvious for some time. Elsewhere, Joey Quinn spends the holiday with his reporter girlfriend Christine Hill, but he clearly has commitment issues and is starting to feel hemmed in. After he leaves, she gets a surprise visit from her father. Written by garykmcd

Dexter is chasing Arthur and sees that he is stalking two siblings with their babysitter and kidnaps the boy Scott Smith in an arcade. Soon Dexter learns that there are several ten year old boys missing and they begin Trinity's cycle of four victims, and not three as Lundy believed. Dexter meets Jonah expecting to discover where his father might have gone and hold the boy captive. Meanwhile Debra gives and interview to Christine and asks Angel to check the journalist's reaction when she asks how she could have been so fast to arrive in the crime scene. Angel sends samples of Christine and after the DNA analysis, they find that Christine and Trinity are relatives and Christine is arrested. Written by Claudio Carvalho, Rio de Janeiro, Brazil

Dexter is determined to take care of the Trinity Killer/Arthur Mitchell himself, at least in part to atone for the mistake he made. When Dexter learns that Christine Hill is in custody, he realizes that the police will soon be onto Arthur, so he sets up an elaborate ruse to send them down the wrong path. It all backfires and ends in another death. Arthur also learns Dexter's real name and the work he does. Meanwhile, Rita finally tells Dexter about the kiss at Thanksgiving, but isn't quite sure what to make of his nonplussed reaction. Also, Laguerta and Batista are caught kissing on a store surveillance video and Captain Matthews is set on having them both fired. They decide there's only one way to get out of he mess they've created for themselves. Written by garykmcd

Dexter is obsessed with getting the Trinity Killer himself, especially after Arthur has tracked him to Metro Homicide and learns his real identity. Dexter realizes the threat to his family and with the older stepchildren off with their grandparents, he convinces Rita to take Harrison to the Keys where he will join them later for a weekend honeymoon. His first attempt to take care of Arthur goes awry when as a result of a traffic accident, he finds himself in jail for leaving the scene. His second attempt is more successful, but his obsession to kill Arthur comes with a price. Meanwhile, no one can quite understand why Debra is still at work given what happened to Christine Hill, but when the FBI takes over the Trinity Killer case, she refocuses on learning more about her father and his relationship with his confidential informants. Debra finally learns about how her father came to adopt Dexter. Also, Laguerta and Batista now have to decide what to do next in their relationship. Written by garykmcd