As Salem suffers under a plague - the result of the Grand Rite - Mary tries to secure her hold over Salem's Witch and human population.

Mary embarks on an act of retribution against Mercy and moves forward to complete her Hive's dark plan.

A former foe helps Mary keep Salem in the witches' hands.

In a bid to determine who orchestrated the recent attack against her, Mary begins to tutor Anne in the ways of witchcraft.

In order to fend off Hathorne's continued bid for power, Mary once again forces George into her service.

The arrival of the Countess Marburg and her son in Salem brings new troubles of varying sorts for Mary.

Mary resorts to drastic measures to attain much needed information.

Mary strikes a tenuous deal to try and gain the upper hand against the Countess.

Mary attempts to save her son from Marburg's clutches.

As the Countess prepares for the arrival of her lover, Mary's endgame comes into focus.

Mary has a public fall from grace. John and Cotton proceed in their all-important task and get a glimpse of their hidden foe.

The final countdown to the consecration begins.

With her mission seemingly accomplished, the Countess Marburg learns a game-changing truth about the object of her devotion. Mary stages a last-ditch effort to defeat the Countess. Cotton and Mercy learn unwelcome truths which upend their worlds.