In 1998, Phoebe moves to the Halliwell Manor in San Francisco to live with her sisters. When she discovers the family;;;s Book of Shadows, she learns that she and her sisters are the most powerful witches ever known. The strong-willed Prue Halliwell can move objects with her mind, reserved Piper Halliwell is able to freeze time, and the uninhibited Phoebe Halliwell sees the future. Together they have the Power of Three, which they must use to fight demons and warlocks, and protect the innocent.