I so badly wanted to give this five stars as the well-realized mysterious setting and unnerving energy of the story are incredible. However, I unfortunately found it lacking in many surprises: by halfway through part two the story was obvious and there was a lot of wheel-spinning to get to the point where the villains show up at the end of part three. It takes a great TARDIS team and pushes them to their limits, but I wish it had more surprises.