A wonderful tour de force: a cross between The Hitch-Hiker's Guide to the Galaxy and Blackadder, combining comedy-based science fiction with comedy-based historical fiction. At no point does it attempt real history, yet it manages to be easily the best historical Doctor Who serial since City of Death.
And the allusions to Douglas Adams are not misplaced: this is one of the very few Big Finish productions written by a professional scriptwriter, in this case the excellent Nev Fountain, known for his comic scripts for the BBC's Dead Ringers series. And the first professional comedy writer since Douglas Adams to attempt Doctor Who as humour.
This is an extremely sophisticated comedy, written as undergraduate humour. Meaning, literally, humour written by someone with an undergraduate-level comprehension of medieval history. It's teeming with historical and literary allusions, especially Shakespearian allusions, that will pass clear over the head of the average science fiction fan. I've noticed some negative reviews of the serial, and understandably so, because this is an extremely clever script, which clearly was beyond the comprehension of whoever posted those reviews, which was why they didn't enjoy it.
Very enjoyable by anyone who liked Hitch-Hiker or City of Death or Blackadder. But no monsters. It's a comedy, squarely aimed at the audience which revelled in the works of Douglas Adams, but with much more in it for those who enjoy undergraduate humour generally. And every scene advances the plot. No running up and down corridors to pad out a thin tale here! So no monsters, and a complex plot; but a lot of jokes.
Like Blackadder, a good deal of the historical detail is fictitious, so don't take it too literally, but quite possibly the best-ever script produced by Big Finish.