 Piper stops alone at a park in the night with a flat tire and is attacked and scratched by a bestial creature, while calling the auto club. She is save by Billy, a man that has recently lost his fiancée to the monster, and he uses a flare to scare the creature. While recovering in the hospital, the FBI agent Ashley Fallon arrives and tells Andy that Piper is the first victim to survive the attack of the creature, and she joins Andy in the investigation. Pipe reads in the Book of Shadow that the Wendigo is a normal person during the day, unleashing along three consecutive full moon nights and eating the hearts of their victim. She tells Billy, and he calls Fallon, but when they meet each other, he discloses that she is actually the Wendigo. Meanwhile Piper sees the beginning of her transformation in the arm and her attitudes. Prue and Phoebe need to kill the Wendigo to save Piper.