[And, of course, I have to warn you about spoilers ahead ... ]
It came out of left field. And it's close to the last thing I would have expected -- that's why it's such an unexpected twist. Not much, really has built up to this. Though ...
We've seen Captain Spencer seriously unhappy about his ex-wife. He'd have no compunction about making her suffer (psychologically), which he strongly feels she made happen to him. But to the extent of kidnapping their son, and cutting off his finger? True, he hesitated -- as young Dexter discovered -- but even so. What kind of father who loves his son would do that? Unless loving his son was just an act, but I don't think so.
I'm hoping we'll find out more about Spencer's motivation as this season continues. As it stands now, the main question is what will Dexter do about it? Probably tell Harry. But what other people in the Department? LaGuerta, Batista, etc? Who was Captain in the first Dexter series that began back in 2006? Tom Matthews, right? So we know that Aaron Spencer didn't stay in that job between Dexter: Original Sin and the original Dexter.
The question of what will now happen to Spencer raises another question: who else of the characters we've come to know either won't survive this first season of Original Sin, or will have very different jobs when the 10th and final episode this first season concludes. We know, of course, that Masuka, LaGuerta, and Batista stay in the same business well into the original Dexter series. And we also know that, by then, Harry and his wife and Dexter's mother are gone. (As for Harry, I bet that's one of reasons we saw him smoking in tonight's episode 1.7)
Questions like that are what make a well-done prequel series like Original Sin so good to watch. And I'll be back here next week with my review of 1.8.
See also Dexter: Original Sin 1.1: Activation of the Code ... 1.2-1.3: "The Finger Is Missing" ... 1.4: The Role of Luck in Dexter's Profession and Life ... 1.5: Revelations and Relations ... 1.6: On the Strong, Non-Serial-Killer Parts of the Show
And see also Dexter Season 6 Sneak Preview Review ... Dexter 6.4: Two Numbers and Two Killers Equals? ... Dexter 6.5 and 6.6: Decisive Sam ... Dexter 6.7: The State of Nebraska ... Dexter 6.8: Is Gellar Really Real? .... Dexter 6.9: And Geller Is ... ... Dexter's Take on Videogames in 6.10 ...Dexter and Debra: Dexter 6.11 ... Dexter Season 6 Finale: Through the Eyes of a Different Love
And see also Dexter Season 4: Sneak Preview Review ... The Family Man on Dexter 4.5 ...Dexter on the Couch in 4.6 ... Dexter 4.7: 'He Can't Kill Bambi' ... Dexter 4.8: Great Mistakes ...4.9: Trinity's Surprising Daughter ... 4.10: More than Trinity ... 4.11: The "Soulless, Anti-Family Schmuck" ... 4.12: Revenges and Recapitulations
And see also reviews of Season 3: Season's Happy Endings? ... Double Surprise ... Psychotic Law vs. Sociopath Science ... The Bright, Elusive Butterfly of Dexter ... The True Nature of Miguel ...Si Se Puede on Dexter ... and Dexter 3: Sneak Preview Review
See also about Season 1: First Place to Dexter