Scarlett, Sapphire, and Sage Sinister are all evil witches attending Witch University and the daughters of Silas Sinister. While Sapphire and Sage act as the twin-followers, Scarlett acts as the ring-leader. They secretly defy the "No Magic" rule by using their powers whenever there is no teacher watching. They work with a few professors and their father to make Marnie open a box with the Cromwell family's ultimate magic in it. In the end, their plan backfires and they lose their family's magic and become humans as punishment for their father's crimes.