If you think about it, there's only four episodes left, so around about now is a good time to end Tanya's little story in the series. It is a shame, because if this show was 24/26 episodes, then she would have been fleshed out a bit more.
I did like the whole "you won't find a Russian who doesn't like the sun", and how it played a role in this episode, along with the pool flashback, and it being the final place to end Tanya's character. Little things like that remind me of the first season.
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