"We must get to the bottom of this dark and queer business, no matter what the cost!"
Something ghastly is afoot in Victorian Yorkshire. Something that
kills. Bodies are washing up in the canal, their skin a waxy, glowing
red,but just what is this crimson horror? Madam Vastra, Jenny
and Strax are despatched to investigate the mystery. Strangely reluctant
to assist their enquiries is Mrs Winifred Gillyflower, matriarch of
‘Sweetville’, a seemingly utopian workers’ community.