This is another very strong episode for the stellar Season 4 of Charmed. Piper is tiring both Phoebe and Cole out with her drive to vanquish demons. She is being openly hostile to Paige and won't listen to Leo. This is another role switch from the last episode, where Piper seemed somewhat recovered from her grief and Phoebe was the troubled one. Here Phoebe is back to being the sane sister and mediator between Piper and Paige. Fulfilling her role as the spirited sister, Paige borrows the Book of Shadows so she can cast some spells for personal gain. As usual when spells are cast, this leads to some unexpected consequences. Her subplot is mostly of the lighthearted variety. It is understandable that she is still grappling with the idea of being a witch.
Piper's grief issues are the primary plot of the episode. I really appreciate how this season spent the first 3 episodes dealing with Piper's grief over her sister. It shows how seriously the writers take the characters and the realism of the show. As they are throughout the season, Cole and Leo remain strong participators in the events. Perhaps my favorite moment in the episode is when Cole prepares an energy ball to blast Piper when she is attacking her sisters. Phoebe shows off some of her own strength in her fight with Piper, and Paige fittingly saves the day by guessing at Piper's hidden fury. Leo also plays a key role when he shows up in the nick of time to orb Piper and Paige to the mausoleum. Holly Marie is amazing once again in that emotional scene.
The final scene between Piper and Paige is very well done and enjoyable to watch, and the episode comes to a satisfying end with Piper referring to Paige as her sister.
Great episode all around. Season 4 continues to satisfy all expectations.
BTW, this is also the first episode where Paige uses what will come to be HER spell- Let the object of objection become but a dream as I cause the scene to be unseen.