
Mel and Maggie Vera suffer a shock when their mother dies suddenly, but before they have time to heal from their loss, another surprise shows up on their doorstep in the shape of an older sister -- brilliant geneticist Macy -- whom their mother never told them existed. The emotional stress takes its toll and the girls begin to exhibit impossible new abilities. An explanation comes from an unexpected place: the new chair of the women's studies department. Harry Greenwood reveals that the three are powerful witches, and he is their whitelighter, there to advise and guide them as they battle dark forces.
Macy is not able to trust herself due to her memory lapses, so she asks Harry and Charity for help; Macy starts to piece things together and is eager to share her vision with her sisters; Mel and Maggie turn to an unexpected source for help.
Parker informs Maggie about a mysterious death on campus that might be of a demonic nature; Galvin remembers something from his grandma's stories that could help Macy overcome her dark side.
Macy goes against Harry's advice and summons a necromancer, which puts her and Maggie in harm's way; with Lucy's encouragement, Maggie attends a frat party to help her get over Parker; Mel helps Harry, who is struggling with his regained memories.