John Aiden discovers upon returning from war that the woman he was seeing is now married to someone else. He also discovers that his hometown of Salem is in a state of panic, with locals convinced witches live amongst them.
Fears grow in Salem that witches are around, so John investigates what's really going on. Mary puts her plans into action.
Mary comes to a decision about A course of action after she discoveres who witnessed the witches' ceremony.
Alden is concerned that a old nemesis' arrival in Salem could destroy him when they expose his secrets. Mary loses control of Mercy.
Aiden and Cotton get involved with a dangerous relic. Mary and her coven have a disagreement.
Alden and Cotton find themselves coming face-to-face with a real witch whilst Mary thinks of a solution to the conflict within the coven.