Solved - Obession / Possesion

[Bree]

I'm sure this is a long shot but I'm going to give it a try. A few years ago (roughly six to eight) I recieved a bag of books that seemed to be mostly from bargin stores (like Dollar General). There was a book called Obession or Obsessed. I vaguely remember the plot being about twin sisters who were seperated at birth. I know the at the end of the book the one twin had taken possesion of the other twin. I also believe that one of the twins wore a necklace with a baby ring on it that had the ends weilded together so the necklace could not come off. I also believe the next book was called Possesion. If anybody knows who the author is to these books it would be fantastic. Thank you to anyone who could help

 

[Occlith]

The author's name is Wendy Morgan.