Obviously the central mystery in Ringer is shaping up to be "Why did Siobhan disappear and what did she think would happen to Bridget?" We could go a couple different ways on this.
Siobhan using Bridget as a mark but not necessarily having bad intentions towards her.
It could be that Siobhan decided to fake her death in such a way that her sister would be the witness and Siobhan would be free to disappear. Or collect insurance money - maybe Andrew's in on it and not sure why Bridget didn't do what she was expected to in the first place. But then, all we have towards that theory is his whispered phone call that he "wants out" and the assumption that the husband would inherit.
In that case, the implication that Bridget is messing things up comes from Bridget not reporting Siobhan dead and trying to take her place. Maybe she and Henry were planning to take the money and run and he was over-playing his needy because he thought he could nudge Bridget into giving up the ruse. So that leaves Gemma on the hook for the killer in the loft, having somehow twigged to the fact that Siobhan and Henry were having an affair. (Maybe.)
But this is a short-term solution series arc-wise. Once the truth is out, is there anywhere to go?
Siobhan wanted to fake her death and decided to set Bridget up for it along the way.
The one unarguable element is that Siobhan decided to leave town and leave her life behind. It's unlikely that all these people are in on the deal, so some of them would probably be sincerely concerned that she disappeared. Did Siobhan hope that Bridget would be blamed for what happened? She went through a certain amount of trouble to leave the rings in the pill bottle right where Bridget would likely pick it up and get her fingerprints all over it.
This is Siobhan wanting revenge on her sister, but not thinking the plot through very clearly. Maybe she thought Bridget would make a run for it, try to pawn the jewelry or something, and get caught in a situation where no one is going to believe what happened. It's less "Bridget messed up the plan" and more "not a very good plan to start with." This is like Law and Order: Criminal Intent sort of plan.
In this case, we're left not knowing who wants Siobhan dead. It also raises the possibility that Siobhan didn't know that someone was trying to kill her and wanted to disappear for other reasons - like the pregnancy. Or maybe the announcement of the pregnancy sparked the killer to make a move? More possibilities here.
Siobhan as indifferent to her sister's fate.
So the first two options assume that Siobhan is declared missing or dead right off the bat. But maybe Siobhan figured that Bridget was in the generic sort of trouble that Bridget is always in and planned for her taking Siobhan's place and drawing the heat off of Siobhan accidentally on purpose. She made a very plain statement that no one in her life knew she had a twin sister, dangling all sorts of possibilities out there for Bridget.
But then Bridget not dying doesn't exactly wreck that plan. And we're back to asking whether Siobhan knew she was a target or not. Maybe the assassination wraps back to the murder trial? The sponsor or the cop told the mobster that Bridget was masquerading as Siobhan and that's why Siobhan's name was on the photo instead of Bridget's. Though why the killer had a neatly labelled photo is strange to begin with. If you're a professional killer for hire - having successfully lured your victim to a deserted building - are you really the sort that needs to carry around your hit list in your jacket pocket?
Siobhan deliberately wanted to kill her sister in such a way that everyone would think Siobhan died.
This is Siobhan setting up the situation where Bridget takes her place and then hiring the guy to kill Bridget as Siobhan. This is Siobhan not just wanting to disappear, but needing to give everyone a body to mourn and seal the deal on it. This is Siobhan wanting her sister dead, for reasons unknown but likely related to the photo of the little boy that Bridget was sobbing over. Or being a complete psychopath and not caring at all that someone was going to die and that someone was her twin.
But of course, this plot hinges on Bridget making the choice she did to impersonate her sister, which was never the obvious choice unless Siobhan knew how much trouble Bridget was really in. I mean, it was probably safe to assume Bridget was in some kind of trouble, but stealing her sister's life is going a bit far.
What Do I Think?
I'm leaning towards the middle - indifference. Maybe Siobhan didn't care either way what happened, but figured that Bridget's presence would muddy the waters. I don't think she wanted her sister dead - perhaps just wanted her in trouble or jail. I'm going to guess that Siobhan has her own scheme going and will be surprised to learn about the attempt on "her" life.
To be ultimately satisfying, however, what I'm going to want is for the reasoning behind Siobhan's decision to leave town and target Bridget to be juicier than just hiding a pregnancy or some financial scam.
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