This was wonderful, more of my speed, personally. My favourite of this range so far. The story's atmosphere and performances were great (Peter Purves was especially good). I was quite fond of the side characters here: Qureshi, Moreland, and Thorn. The buildup for the first 3 parts had me very keen.

I will admit though, that the last part was strangely paced and a little rushed. Saw part of the twist coming. Not the "why" though, so I imagined that an interesting explanation would make up for the deliberateness of the obvious. It didn't really, but still, it was a good story.