London, 1750: Beatrice Scarlet is the apothecary's daughter. She can mix medicines and herbs to save the lives of her neighbours - but, try as she might, she can't save the lives of her parents. An orphan at just sixteen, Beatrice marries a preacher and emigrates to America. New Hampshire, 1756: In the farming community where Beatrice now lives, six pigs are found viciously slaughtered; slices of looking-glass embedded in their mouths. According to scripture, this is the work of Satan - but Beatrice Scarlet suspects the hands of men. As she closes in on the killer, she must act quickly to unmask him - or become the next victim herself...