An evil demon named Eames has been killing good witches and their whitelighters in order to obtain their powers. After Eames kills his latest victim, her whitelighter Natalie comes to help Leo protect Prue, Piper, and Phoebe. Due to Natalie's insistence that things be done by the book, she constantly butts heads with the sisters, and that eventually has some dire consequences for the whitelighter. As a result, they go about vanquishing Eames their own way. Meanwhile, Phoebe shares a big secret about Cole with Leo.