Cassie is sad that her temporary teaching assignment is winding down. Sam is forced to take unused vacation time, so he and Cassie try to find a hobby they both enjoy. Joy has a decision to make when Donna finds a new job for them in Vermont. Martha's worried about her housewarming party when final details of the renovation go awry. As Adam's mission nears, he and Stephanie try to figure out what this means for their relationship. Abigail and Donovan reunite to make one last stand against the curse and fight for their future.
A mysterious, darkly beautiful woman named Cassandra Nightingale moves into an old, abandoned house which is reputed to be haunted by its original owner, "The Grey Lady". The small community is divided in their opinion of her: Some want her to stay (especially widowed police chief Jake Russell and his two children), while others want her to leave. Through the course of the story, seemingly magical things happen, and the community attributes these occurrences to her. Everyone begins to wonder if she is really a witch.