Something Wicca This Way Goes

With the Book of Shadows finally in his possession, Zankou plans to open the Spiritual Nexus and take in the power of the Shadow.  To divert Zankou's attention away from the Nexus, Piper, Phoebe and Paige successfully goad him into coming after them instead.  Using a spell from the Book of Shadows, Zankou steals Phoebe's premonition power, which enables him to anticipate and thwart their attacks.  The sisters come to the realization that the only way to stop Zankou may be to sacrifice themselves.  Meanwhile, Agent Keyes from Homeland Security reveals to Inspector Sheridan his suspicions about the The Charmed Ones involvement with the supernatural.  Sheridan volunteers to go into the Halliwell manor with a micro-video recorder and ends up blowing the sisters' secret wide open.