The devil has arrived in Salem, but the witches who summoned him find that he has deceived them. His plans will bring nothing but slavery and death to humanity. Only one woman can stop him: his mother Mary Sibley.
As the comet continues to hurtle towards Earth, John Alden struggles to survive. Anne Hale, meanwhile, tries to protect someone whose life or death could have major consequences for the witches as well as the ordinary mortals.