This is part of a series of reviews of Doctor Who in chronological timeline order.

Previous Story: Harry Houdini's War

As someone very familiar with Bletchley, it's really weird to hear it be the main setting for a story. I understand why but that doesn't mean it ever won't be odd hearing Colin Baker talk about it. Constance is quite fun so far, it seems like she'll bring an interesting dynamic to the TARDIS. Miranda Raison's performance is great and I'm surprised to find that she played Tallulah in the Daleks in Manhattan two-parter.

The story itself is pretty decent, I really like how the Doctor resolved the tired trope of "the Doctor is a suspected spy" by just letting everyone into the TARDIS and convincing them he was an alien. The idea of the Waveform is a bit boring, they're basically just Vardans. The "Agent Criss-Cross" twist was obvious from a mile away, mainly because he was played exactly like every "shifty criminal with no moral compass" character that Big Finish has ever done.

Overall, I might be a bit biased but I think this is pretty solid.

Next Story: Planet of the Rani