In the Season 4 finale, 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
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Dogged Debra’s investigative skills have the department on the verge of not only nailing the Trinity Killer, but ultimately exposing Dexter’s clandestine and deadly side job. It would also deprive him of the opportunity to deal with the serial murderer in his own way. At home, Rita’s decision to confide in her husband doesn’t garner the result for which she hoped. And back in the squad room, a breach of ethics has Batista and LaGuerta in hot water
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Dogged Debra’s investigative skills have the department on the verge of not only nailing the Trinity Killer, but ultimately exposing Dexter’s clandestine and deadly side job. It would also deprive him of the opportunity to deal with the serial murderer in his own way. At home, Rita’s decision to confide in her husband doesn’t garner the result for which she hoped. And back in the squad room, a breach of ethics has Batista and LaGuerta in hot water
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Dexter studies those closest to Arthur in an attempt to understand the psychology behind the Trinity Killer’s actions; Rita’s Thanksgiving-dinner plans are complicated when her full house gets even fuller with the addition of some unexpected guests; Batista sees some closure on a troubling old case; and Debra’s continued pursuit of the Trinity Killer may prove a threat to Dexter.
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Dexter learns the Trinity Killer may be taking his act on the road when the homicidal maniac plans an out-of-town trip. To gather more insight into the mind of the murderer, Dexter decides to accompany him, but isn’t really ready for some of the shocking revelations of which he becomes privy. Back in Miami, a technicality is keeping Debra off the Trinity case, but she utilizes others in the department to get her opinions registered
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Dexter strikes a balance between family, work and his secret life; Debra expresses a renewed interest in her father’s past.
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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.
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.
Rita and the children take an out-of-town trip, leaving Dexter behind for some long-overdue rest and relaxation, which he instead channels into chasing down a new victim. But his investigation turns up some surprising results and he begins to empathize with the killer, a policewoman who murdered her entire family.
When a rash of vandalism strikes Dexter’s new neighborhood, the increased vigilance of his neighbors impacts his ability to take care of his side business, and it doesn’t help matters that he is temporarily unable to drive. As for the Trinity Killer, Dexter is developing an appreciation and admiration for his incredibly impressive technique.