Doc and Bill liberate the rocket-fuel-crapping tape worm mapping the intestinal tract of the British Isles
That bad girl the TARDIS has enforced on Doc and Bill a detour on the way back to Nardole’s tea party, namely to London’s famous and much-frequented final Frost Fair of 1814, where the elephants in the room are real elephants on the ice, and also the continuation of slavery.
But betwixt the acrobats, sword-swallowers, swarthy wrestlers from exotic climes, and pies of questionable provenance there is chicanery afoot, as bioluminescent swarms in the subglacial drink are picking off straggling drunkards and urchins in an ice-cold analogy of society’s cracks.
Rather than following the solid lead of a tattoo-handed man, Doc thinks it’d be more fun to use Bill as giant fish bait. Under cover of night, they dive feet first into a deep, dark mystery, at the putrid heart of which is, just what the shit is the well-out-of-ordure evil industrialist Lord Sutcliffe up to?