Rate "Heaven Sent"

Well, here we go- the build-up to big Series 9 finale is now upon us. And here is your brief:

“When, at last, you rise to go, there will be another shadow next to yours. And your life will then be over."

In a world unlike any other he has seen, the Doctor faces the greatest challenge of his many lives. And he must face it alone.

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Provocative questions arise out of last week's story: who did Ashildr make her deal with to trap the Doctor? Are the Timelords somehow involved, and if so, why go to all that trouble to bring the Doctor in? And what has really happened to Clara?

This week may answer some of those questions. If so, feel free to post your thoughts, reactions and theories below. Standard spoiler warning applies: if you wander into this thread before you've actually seen it, you may learn things that could effect your enjoyment of the story, so be warned.

Now, post away...