De tre systrarna Halliwell, ättlingar till goda kvinnliga häxor, kämpar mot onda krafter med hjälp av sin kombinerade häxkraft som kallas "The Power of Three".
The Source breaks an age-old agreement between good and evil by stealing The Hollow, an ancient vapor which he uses to absorb Piper & Paige's powers. Meanwhile, Phoebe must allow Cole to help them.
S4A13 44 min
