Lois's younger sister, Lucy, with whom Lois doesn't get along, comes to town and charms everyone she meets. However, Clark discovers a darker side to Lucy after he catches her stealing money from a bar and forces her to reveal the truth about her sudden appearance in Smallville, a truth that puts Lois in grave danger. Meanwhile, the crystal disappears from Lana's apartment and Jason accuses Lionel of stealing it. I was quite impressed on how Jason's attitude towards Lionel seeing that "no one messes with the Luthors." The episode also features a cameo appearance by Krypto. It wasn't that good of an episode, which, ironically, made Lois look better.