Following the first death of the Grand Rite, Mary intends to sacrifice another innocent before the next full hunters moon in the form of a sign. Meanwhile, John works with Cotton Mather and Issac Walton in order to locate and stop the witches.

A face from John's past comes to Salem, and Mary's plans nearly come apart when she loses control of Mercy Lewis. Elsewhere, Mary's most trusted ally, Tituba, is forced to deceive John in order to eliminate a threat that endangers her mistress.