The Pyralis Effect neatly bridges the gap between seasons 17 and 18 of Doctor Who. The story has a real 'hard' science fiction' feel to it, in line with many of the televised stories from this era such as Nightmare of Eden and The Leisure Hive, and I could easily imagine this story being transmitted. It's a very atmospheric and tense adventure, with some wonderful sound effects and music that really suck the listener into the story. Lalla Ward reads brilliantly, I think she's one of the best narrators in the companion chronicles range. In execution the story feels more at home in the serious and thought-provoking season 18, than the rather silly and lightweight season 17, although the Doctor is presented more like the jokey Doctor of season 17, so the story bridges the transition well. The 60-ish minute run time feels just right, it doesn't outstay it's welcome but tells a good strong tale, with plenty of incident and never feels rushed or padded. A very strong entry in the Companion Chronicles series.