A solid if somewhat unremarkable 9th Doctor story about a planetary civial war and interdimensional windows that pass through the moors and feature Emily Bronte as a guide.

I'm not sure why Emily Bronte had to be here to be honest. I don't think it would take a lot to rewrite this story without having her here. It feels like she's here just because Doctor Who has a history of meeting historical figures.

The civil war story is fine. It's a little non descript for the most part, and just as it starts becoming more interesting the story is resolved. Not bad by any means, just nothing special.

I like the ever shifting glass prison though. That's a fun and imaginative setting for it's part in the story.