Lady Jane Bartholomew and Miss Margaret Renard are back and this time they are out to catch a murderer targeting young maidens for sacrifices.

Believing that having come close to getting themselves killed in their last investigation, Sir Hugh, now engaged to Lady Jane Bartholomew and Mr Latham, solicitor to Miss Margaret Renard, are distressed to learn the young ladies are once again up to their old tricks.

Believing they can solve the murders the young ladies may well fall prey and become sacrificial lambs, the gentlemen protect them while trying not to fall victims themselves to the unseen evil walking among them leaving a pile of corpses in its wake?