After ten years of service fighting in the French and Indian War, John Alden returns to his home in Salem, Massachusetts, intent on reuniting with his love, Mary. Upon his arrival, he is stunned to discover that the town has been swept up in a wave of witch hunt hysteria, and that Mary has married the town’s richest and most powerful resident.

With witch fears rising, Alden seeks the truth of what’s really going on in Salem while Cotton continues to wrestle with his guilt and Mary looks to execute a plan. The witches get closer to finding out who interrupted the ceremony, but Mary continues to find her emotions for Alden affecting her focus. A clue in the woods leads Cotton and Isaac to find more evidence that the witches may indeed be real.

Salem trembles in the aftermath of the trial, and Anne turns to John Alden for comfort. Mysterious circumstances lead Alden to suspect Magistrate Hale is not who or what he appears to be. Mary discovers who witnessed the witches’ ceremony and deliberates a course of action. Elsewhere, George Sibley begins hatching a plan to escape Mary’s clutches.

An old nemesis of Alden's arrives in Salem with secrets that could destroy him. Meanwhile, Mary loses her grip on Mercy.

The witches of Salem’s coven meet in the woods – without Mary and Tituba – and agree that they have no choice but to eliminate one of their most dangerous threats: Alden. Meanwhile, Alden and Cotton realize the true, dangerous nature of the mysterious object they uncovered – and use it to ensnare something of much graver importance. Mary realizes that her own coven has been plotting without her… and the relationship between Mary and Mercy is no longer what it seems.

Alden and Cotton find themselves face-to-face with a real witch, and an unlikely ally keeps the coven from tracking down their missing sister. Tituba feels left out when Mary decides to initiate a new member into the coven. As Mary takes her new acolyte under her wing, she recalls her own path after the fateful events surrounding Alden’s departure from town seven years ago. Meanwhile, Alden and Cotton learn to their horror that the trials have actually been helping the witches – and soon find themselves under attack after they lose control of their captive.

Romantic yearnings between Mary and Alden heighten as Cotton deals with a unique accusation in the trials. Meanwhile, a powerful witch hunter makes his way towards Salem.

Increase Mather makes it his first order of business to catch a real witch, and starts by pinpointing a prominent figure from Salem’s most sinful district. Mary worries that Increase will detect that his old friend George is under a spell and enlists the help of Isaac to deter Increase from uncovering the truth. Meanwhile, accusations within Salem intensify and Cotton must deal with a painful turn of events – and Anne’s suspicions of her father reach a fever pitch.

Salem sees a second death since Increase's arrival in town, and Mary struggles to get George back under her control. Mercy and her acolytes flex their growing power while Increase grows closer with Isaac, putting Isaac’s loyalty to Mary in question.

Increase gets closer to understanding who really runs things in Salem; at the same time, Anne finds herself in danger, and in need of Alden's help, while investigating a mystery.

Increase’s warpath continues as Alden finds himself the target of fresh accusations – and at the mercy of the Selectmen, thanks to a surprise move by a healthier George Sibley – leading Mary to hatch a desperate plan to save him. Cotton finds himself frozen in a tug of war between his father and his loyalty to Alden. Meanwhile, Anne learns the truth about her father.

Alden’s trial begins, triggering a chain of events that breaks nearly every remaining allegiance left in Salem. While Mary arms the Malum for the Grand Rite, the coven elders urge her to use Alden as the final sacrifice. Increase seizes Mercy’s acolytes for information to use against Alden – an act that carries more consequences than anyone anticipated.

Alden comes to learn Mary's biggest secret.

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.

Mary and Countess Marburg keep up appearances while continuing their covert battle for Salem.

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.

Salem's only hope to survive the hell that has risen is to raise the dead.

Mary leaves the comfort of Alden's embrace, determined to do whatever it takes to keep evil at bay.

Mary’s penance for her betrayal takes a deadly turn while Cotton is forced to perform an exorcism of his own.

Cotton discovers life-altering news while Mary learns the power of her femininity.

A traitor is exposed while a ghost from Salem’s past makes a shocking appearance.

Mary and Alden's twisted love is put to the ultimate test and Anne plunges into dark magic.

Anne's pregnancy starts to show as her house-guest goes to work for Mercy. Isaac finds himself in a new role and seems to enjoy it. Plans are made to defeat the dark child and the boy goes to pieces.

Mortal enemies are forced to work together to keep the door to hell locked.

Hearts are destroyed when everyone's true colors are revealed and one bleeds darker than the rest.

Series Finale. Everyone prepares on the eve of Salem's demise.