Cassie and Sam prepare to send Grace and Nick away to college, joined by Nick's mom, who worries about his cross-country move to college. Grace spends her last days in Middleton helping a designer make a dress, and uncovering her true passion in the process. Stephanie and Adam balance a busy workload and their relationship. Abigail struggles to respond when Donovan shares his feelings for her, unsure if a curse may be to blame. Meanwhile, Sam and Martha continue the hunt for the Middleton treasure, lead ing to an unexpected discovery.
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.