Following the death of her mother, Cassie Blake moves to Chance Harbor, Washington to live with her grandmother. Her attempts to adjust to the new town are crushed when five of her classmates, Adam Conant , Diana Meade , Faye Chamberlain , Melissa Glaser , and Nick Armstrong reveal to Cassie that she comes from a long line of witches and is the final member of their coven; with her they are able to unlock the full extent of their powers. Initially Cassie refuses to believe that she is a witch, even after Adam helps her to unlock her powers. It is only after she discovers an old leather-bound book of spells left to her by her late mother, Amelia, that Cassie begins to accept her power. Inside the book is a message to Cassie explaining that she kept their real family history and her powers a secret in order to keep her safe; as the circle soon finds out, their powers attract dark and dangerous attention that constantly puts them in harm's way.