Following the tragic death of her mother in a fire, Cassie Blake relocates to the picturesque town of Chance Harbor, Washington, to live with her grandmother. As she becomes acquainted with her new high school peers—such as the kind-hearted Diana and her boyfriend Adam, the enigmatic loner Nick, the antagonistic Faye, and her accomplice Melissa—unsettling and mysterious events start to unfold. It turns out they are all descendants of formidable witches, eagerly anticipating Cassie’s arrival to complete the new generation of the Secret Circle. However, Cassie and her friends remain unaware of the sinister forces at work, potentially connected to the town’s adults, and the possibility that her mother’s death was no mere accident.