Season 4

01 Living the Dream Episode 127th September 2009 Dexter sleeplessly struggles to balance his new family life with his dark, murderous drive for a fresh victim, and his busier-than-ever forensic career pursuing a new target, "The Trinity Killer." 02 Remains to Be Seen Episode 24th October 2009 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 Frank Lundy insists are the work of Trinity. 03 Blinded by the Light Episode 311th October 2009 Dexter is hampered by his neighborhood's increased vigilance due to vandalism, his temporary inability to drive himself anywhere, and his admiration for the killing technique of the artful Trinity Killer. 04 Dex Takes a Holiday Episode 418th October 2009 Rita goes to a wedding with the kids, allowing Dexter to have his own little vacation. He does what he does best when alone, hunt, and goes after an officer with a dark secret. 05 Dirty Harry Episode 525th October 2009 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. 06 If I Had a Hammer Episode 61st November 2009 Dexter doubles his efforts to stay ahead of the official Trinity investigation, and receives relationship advice about the friction between himself and Rita from a most unexpected source. 07 Slack Tide Episode 78th November 2009 Dexter finally strikes a balance between family, career and his secret life, but is thwarted in his pursuit of his next victim, while Debra expresses a renewed and unwelcome interest in their father's checkered past. Miami Metro Homicide tries to solve the Model Killer Case. 08 Road Kill Episode 815th November 2009 Dexter wonders if his father's Code is truly the right path, and hopes to get answers by accompanying Trinity on an out-of-town road trip to Tampa; Debra discovers that her single-minded pursuit of Trinity has blinded her to the true identity of her assailant. 09 Hungry Man Episode 922nd November 2009 Dexter learns more about Arthur's bizarre and twisted world, while Rita has her hands full preparing Thanksgiving dinner for a full house, Debra uses the holiday to further investigate Trinity, and Batista gets closure on an old case. 10 Lost Boys Episode 1029th November 2009 The disappearance of a ten-year-old boy forces Dexter to question his assumptions about Trinity, while Cody defends one of Dexter's lies and Masuka is unable to face what he witnessed on Thanksgiving. 11 Hello, Dexter Morgan Episode 116th December 2009 Dexter must buy time to protect himself when Debra's investigation brings the department one step away from identifying Arthur as the Trinity Killer; Rita confides in Dexter, but is disappointed in the result. 12 The Getaway Episode 1213th December 2009 Dexter and Arthur are on a collision course.