Hmmm ... not quite sure what to make of this story.
I think I found it hard to quite take it seriously - I find that the fact that the Senior Prosecutor could have such an obsessive take on Poe, and yet still be put in charge of a war criminal, the apparent perpetrator of such massive horror, to be somewhat hard to believe. The whole prison complex being built around Poe's ideas seemed just too wacky to quite take seriously. Really, would any regime or judiciary system condone such a Prosecutor's fancies?
And the Ravens? I'm not sure why, but they reminded me somewhat of Thompson and Thomson from Tintin.
The scenes with the Pit and the Pendulum, and the being buried alive - well, they were somewhat predictable once you knew the Prosecutor's predeliction for Poe.
Not a great dramatic story - the horror wasn't really there. And not a funny story - the humour wasn't there. Somehow the story fell between two stools, and didn't quite make a success of itself.
Held together really only by good acting on the part of the actress playing Tamsin, and the always great presence of Paul McGann in consistent form.
Good only really as a bridging story between Situation Vacant and the next story in the series which you feel is leading somewhere with the Time Lords involvement in some shape or form.