1845. When a man is found dead along the Cornish coast, Shilly and Anna are asked to investigate. Could there be a simple explanation or does the local talk of sirens have some truth to it after all?
Cornwall 1845. What caused the death of a tattooed stranger found on Morwenstow beach clutching a key? Is he a victim of deliberate wrecking, lured by false lights? Or are tales of savage mermaids true?