The Class audio series seems to be settling in to a kind of formula. Each story picks out one or two of the main TV characters, then introduces a new character who is not what they seem. The main characters go along with it but then things end up getting a bit weird. That pretty much sums up this episode.

All in all, not the most memorable of stories. If Big Finish don't do something to break out of this formula, then I don't see much future for the Class series. They managed it with Torchwood, and there is no end in sight for that series.