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.
Cotton escapes and learns something very important that could change his life. Mary, meanwhile, discovers the power of her femininity and decides to take up the fight against Satan.
Mary's penance for her betrayal takes a deadly turn while Cotton is forced to perform an exorcism of his own.
Mercy wants to rule Salem alone and uses Hathorne to do so. Anne is pregnant and being tortured by the devil. Cotton therefore returns to save and protect his unborn child and Anne.