Eight years ago Abby babysat Elizabeth Blume, a teen who seemed intent on making Abby's life miserable. Elizabeth imitated Abby's dress, pored over her diary, and sabotaged her love life. Now Elizabeth is back in New Chapel, and she seeon adopts a new look: Abby's. Elizabeth, now going by Libby, copies Abby's entire life - she even owns a bright yellow car and opens a nearly identical shop. But when Libby comes between Abby and her boyfriend, Marco, imitation becomes the sincerest form of trouble, and that's before Abby is accused of murder. Is Abby's devious double the real killer? Or is there a more sinister suspect in town who's using them both to cover his evil crime?