Sister Satan — Dana Reed

Lauren ... is a lonely teenager, the babysitter for her three younger brothers and the target of her father's frequent rages. Her burning desire for a sister, someone to confide in with whom she can share her hopes and dreams, leads her to experiment with the occult powers she has inherited from her grandfather, powers which she has never dared to use -- until now.

Rachel ... a demon from the depths of Hell -- a demon who is outwardly indistinguishable from Lauren, but who is the personification of evil. Rachel leaves a hideous trail of death and destruction in her wake, and not even Lauren, who has summoned this monstrous double, seems capable of diverting her deadly course!