Bad Sister (Identikill #2)

It was hard enough for Chelsea to have a dead sister who kept appearing in her life. But now Angelica has pushed it too far-taking over Chelsea's body and trapping her in a creepy world. Chelsea has to watch in horror as Angelica destroys her life, threatens her best friend, and takes the side of her sworn enemies. Chelsea had always thought Angelica was a good sister, an innocent sister. But now that Angelica's in control, Chelsea can see it clearly: Angelica is a bad sister. And somehow she must be stopped.