A splendid use of the audio form!
An evergreen tale of political power being wielded for personal gain meets a fun monster story where the monster is a sound wave. I think they could have done a bit more with the monster later on but overall I quite liked how it was represented throughout. The Sixth Doctor is in prickly form here, which is not my favorite mode for him, but Peri got to show off what she's learned while in the TARDIS and the supporting cast all did a good job of carving out their identity, which makes for an easier listening experience.

There are a few twists that I could see, well hear, coming but that did not negate my joy when they were revealed later on. Overall, I really enjoyed this one and most importantly enjoyed hearing Big Finish figure out how to make these adventures more than just the audio of the TV program.