Doctor Who: The Reaping

Another reasonably good offering in the 6th Doctor range, this takes the time to explore the impact of Peri's disappearance in Planet of Fire on those she left behind. That's perhaps more interesting than the actual cyberman plot that's behind it all, but that's functional enough, too, and has a nice resolution to it. The beginning is perhaps, a bit strange, but makes more sense once you've also listened to The Gathering, which was published together with this.