Ally, Camila, and Dinah- three sisters, discover they are witches. Luckily for the world, they're of the good variety. Banding together in their ancestral home in San Francisco, they work together to fight evil, with each having a specific special power. Although outwardly they are average women, with jobs, relationships and friends, they are also powerful witches, but when they work together, their powers are enhanced. As The Charmed Ones, their destiny is to protect innocents from evil. But what happens when their youngest sister falls for a demon, another falls for a cupid, and one more falls for a whitelighter? What happens when the power of three turns into the power of four. What happens when Ally, Dinah, and Camila find out about their sister Hailee who falls in love with a mortal.