I liked the fact that this episode was something different. There was more focus on the older generation than just on the girls and the evil that constantly surrounds them because it certainly makes it interesting when the evil is an old friend of your grandmother's who is trying to steal The Book Of Shadows!
Aunt Gayle, and two women want to regain their youth. The would-be witches summon the demon Kryto, who promises them the return of their youth if Gayle will deliver the power of The Charmed Ones. Needless to say, he is lying to them and they start dying rather than getting younger. It's sad, however, when the girls have to face the fact that Gram's friend was using them as they can never forgive her. Not that it matters because she doesn't last long anyway.
Certainly worth watching.