The first part of Fear is an excellent mystery plot, a slow burn where even the listener is left in the dark as to what's really happening. We begin to see fundamental relationships shattered, particuarly entering the second half the story. The second half is much more action-focussed and really starts introducing many of the key themes of this series. This is where Cyberman gets good. This series is an exploration of characters and their relationships, and that begins to get interesting in this story. It's still not as good as the rest of the series to come, but it's getting there.