Two decades ago, two sister witches, Piper, and Phoebe lost a sister during a devastating battle with the Source of All Evil. Prudence, the oldest sister, was the one who had passed away. But after one year of trying to get Prudence back, Piper and Phoebe discover that they had a half-sister, Paige, they never knew they had. They found out that she was not only a witch, but a White Lighter like Piper’s husband, Leo. But, it is 2023 now, and the witches have moved on, and started their own families. But, when a mysterious woman shows up at their doorstep, claiming to be Prudence, Paige has a hard time believing her. But Piper and Phoebe instantaneously accept her into the family, thinking that she was a lost brain-washed witch.