On the anniversary of when they received their powers, the Charmed Ones are forced to face a cloven-hooved demon named Abraxas, who ultimately steals the book of shadows and undoes their spells that releases all the demons the sisters faced in the past. The sisters soon discover that Abraxas is starting to erase the book of shadows, and if he succeeds, they'll lose their powers forever. While dealing with their crisis, Prue, Piper, and Phoebe meet their new neighbors.