Salem's leading witch, Mary Sibley, faces both foreign and domestic challenges to her authority.

Mary initiates the second act of the Grand Rite. Alden returns to Salem.

Mary receives help from a former foe to keep Salem in the grasp of the witches.

Anne explores her supernatural side. Mary receives a chilling warning.

Mary and her tormentor, Countess Marburg, meet face-to-face.

Countess Marburg arrives in Salem and threatens Mary's stronghold on the city.

Countess Marburg's achilles heel is revealed.

Mary makes a sacrifice to save her son from Marburg.

When Mary and Alden join forces, Alden gets his first test in fatherhood.

Mary has a public fall from grace. Alden and Cotton try to save the boy's soul.

Mary makes a last ditch effort to stop Countess Marburg's attempts while alliances shift as surprising truths are revealed.

Mary refuses to believe that her son is still alive while the Countess does everything she can to impress the boy. Ann tries to convince Cotton that she uses her powers for good and Alden balances between life and death.