 Phoebe is serving on a jury in a murder case, and she is convinced that the defendant is guilty. However, when she touches the murder weapon, she has a premonition of the real killer, who has a Medusa tattooed in his right arm. Meanwhile, the irresponsible Paige invites her snoopy friend Glen Belland to stay with her in the Halliwell manor, and he finds the Book of Shadows in the attic. While Piper, Leo and Paige try to find the real killer, Phoebe decides to use magic to prove the innocence of the accused to the jury.