Cordelia's latest vision puts the Coven's future in question. With the end of Fiona's reign approaching, the girls manifest powerful new gifts. Queenie's search for Marie Laveau leads her to Hell and back.
After successfully capturing Rose, John and Cotton plan to extract information on the Grand Rite from her during the planetary alignment with Saturn. Mary assists Mercy in becoming a witch and initiates her into the hive.
Mary can prevent the devil from doing more harm, but in return she must make an incredible sacrifice. Mary tells John of her resurrection, after which she leaves him to do what is necessary to keep evil at bay.
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.