Cassie teaches her art history students a lesson on perspective that transcends the classroom. Sam performs surgery on Adam, who worries about his recovery. Joy has an upsetting dream about Abigail and Donovan's relationship but it may not be what it seems. Martha tries to win over a French delegation and secure Middleton's status as its sister city.
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.