The second part of this face-skinning story begins at quite a pelt, as our witness link from the previous episode is made within the first few minutes. After her input, Buchan’s disgust is palpable at a link to The Texas Chainsaw Massacre, drawing on a work of lurid fiction rather than his treasured archive of fact.

After last week’s supernatural shenanigans, we are back to the gruesome bread and butter of Whitechapel with a serial killer who has a penchant for skinning their victims.

Striking a decidedly supernatural tone, Series 4’s opening two-part tale drew to a close with a rational, scientific explanation for the Witchfinder murders, before expertly throwing all the cards up in the air once again.

Reliably gritty and gruesome, it is time for another slice of serial killer action on the mean streets of Whitechapel.

After two series, each which followed on a single story, last year’s run settled into a more digestible two-part format with each pair of episodes focussing on a new case.