Following Deb walking in on Dexter in the season 6 finale, we found out that Deb would know everything. Though many assume she put pieces together herself, it now appears that Dexter becomes an open book to his sister – even revealing some information about Harry's involvement:
If the series-long quest for Dexter was to finally have someone who really knows him — well, be careful what you wish for because Deb now knows everything and that's a game-changer.
She will learn all about Harry training Dexter and that is another thing that is going to rock her world.
What do you when you find out your brother is a serial killer? Better question: what do you do when you find out that the (adopted) brother that you love is a serial killer? Answer: ask yourself a lot of questions:
So now what does she do? Does she turn him into the police? Is she repulsed by him? Can she continue to love him? Does she feel an odd relief that finally she understands some fundamental part of him that always felt elusive? Dexter was always elusive and Debra always thought it was because of her, and now she knows it wasn't about her, it was about him really protecting her.
But she is the head of the homicide division and so it has to really affect her sense of justice and the whole system. It's a really challenging year for her to juggle.
The moment that Dexter has feared has finally come true; Deb knows the truth. When the closest person in Dexter's life finds out who he truly is, even his Dark Passenger can't stop these new, terrifying emotions. Has the monster grown a heart?
He's never had to deal with these kinds of emotions — regret, guilt, a sense of having let Deb down and also, obviously, the gnawing suspicion that at any time, she could have him arrested.
It is about things he's never experienced before, which are regret, responsibility, shame, betrayal, all of those things. Also, it's the flip side of wanting to be known, and then once you are known, there's a loss of freedom. It comes with heavy responsibility, so he's dealing with a lot of emotions that he's never had before, and never been allowed to feel before or allowed himself to feel before.
While Deb finding out the truth about Dexter will be a great moment in the series, there's still the whole issue of killing many people – especially for someone who, you know, puts those kind of people in jail.
Of course, the most intriguing thing about Dexter's reveal may be the chance to revisit the case of one of Dexter's best characters: Sergeant James Doakes.
There are other complications that will come in because, at the crime scene, Dexter's blood slide gets found by Lieutenant LaGuerta because he loses it in the chaos that ensues and she immediately recognizes it's his.
The only other time that she had seen this blood slide was in the copy case of the Bay Harbor Butcher. Her dear friend Sergeant Doakes, everyone thought he was the Bay Harbor Butcher, and thought that when he died, the Bay Harbor Butcher died with him. Now, she begins to suspect, "Is the Bay Harbor Butcher still alive and how can I set about proving the innocence of my friend Sergeant Doakes?" That is something that's a silent thing at the start, but it's, again, going to be eventually working its way back to Dexter. It's going to be very interesting to see if she can exonerate him.
Some people may not think that Dexter is a charming guy, but Deb obviously feels differently. Even though many people questioned the Deb/Dexter romantic storyline, it'll be interesting to see how this new revelation will impact her feelings towards her brother. While a potential romantic interlude is what many people are focusing on, it should be the internal struggle of Deb dealing with her feelings (through numerous swear words) that's most intriguing:
Obviously this whole season we're going to have great fun playing with every permutation that can be played between Debra and Dexter in their relationship now that this information has come out. She was on her way to the church at the end of the last season because she had come to realize that she not only loved her foster brother Dexter but she is in love with him.
…obviously what she learns is going to affect [her feelings for Dexter], so all of the things that have been the bedrock of Deb's life get moved around. That's part of what we hope will be fascinating for our fans, is to watch and see how we play out all of those various interpretations.
The Guest Stars (& Possible Big Bads)
When guest stars join Dexter for the season, you know that they're either going to be a love interest or a big bad. In this case, maybe both? Well, for one of them anyway.
Ray Stevenson's character, Isaac, comes to Miami when his very close personal lieutenant is accused of killing a Miami cop and then suddenly disappears. So Isaac wants to find out what happened to his friend and how he disappeared. The fact that it was a cop will bring them all around the Miami Metro police system. That is going to be a long story arc.
Also, we have Yvonne Strahovski. She is fantastic. She plays this woman named Hannah, who took off from this small rinky-dink Florida town and ran off with this older guy and they went on this wild killing spree. So when they got caught, she turned state's evidence on the boyfriend, he went to jail for life and she started a new life. Years later, she's in her 30s and she will intersect with Dexter. I would say Hannah is a still water that runs very deep and is quite unlike any woman Dexter has ever known.
There's nothing needy about Hannah. Every woman that Dexter's ever come to either the rescue of or been involved with have been incredibly needy.
Hannah has a cool aloofness, but there's something about her that will intrigue him.
Dexter season 7 premieres September 30 on Showtime
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Source: TV Guide