Piper is reluctant to go to her high school's 10th reunion, despite the facts she's now a successful business owner and that the reunion will be held at her club. Things get complicated when an alchemist accidentally sets free an evil spirt that eventually possesses Piper as she is getting ready for the reunion. As a result, Prue and Phoebe have their hands full trying to get Piper back to normal. Meanwhile Phoebe tries to get some answers about Cole's past.