I agree we are due for some Tamara back story–it seemed to me that she and Greg likely met within the organization for which they work. I’m not sure why I got that vibe, but I don’t think it is just that she met him and got swept up in his quest.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass