Still unable to get over the death of her sister Prue, Piper Halliwell (Holly Marie Combs) vows to devote the rest of her life to hunting down demons. This leaves her vulnerable for possession by The Furies, a band of supernatural vigilantes -- and this means danger for Piper, her surviving sister Phoebe (Alyssa Milano), and "reformed" demon Cole (Julian McMahon). Meanwhile, the Charmed Ones' half sister, Paige (Rose McGowan), inadvertently casts a variety of spells on her co-workers when she tries to make copies of the "Book of Shadows." ~ Rovi