After Prue is accused of stealing a priceless tiara from the Auction House, she is stunned to discover Rex and Hannah are warlocks, set to destroy the power of the charmed ones. When Piper and Phoebe set out to prove Prue's innocence, Rex and Hannah blackmail them to turn over the book of shadows and their powers to them. However, their plan is foiled by a guardian angel that comes to help the sisters.