The Curse of the Ruby Necklace (Sweet Valley Twins)

The Curse of the Ruby Necklace (Sweet Valley Twins) by Pascal, Francine. paperback edition. ISBN: 9780553159493.

Identical twins Jessica and Elizabeth Wakefield are thrilled when they land small parts in a movie being made in Sweet Valley. The film is based on the true story of the mysterious death of twelve-year-old Lillian Keller, and its being filmed at the creepy old Keller mansion. One stormy afternoon, Jessica finds an old necklace on the beach near the mansion. She puts it on, and that very night she has a terrible nightmare about a girl falling to her death. She becomes convinced that someone -- or something -- is trying to tell her that the mystery of Lillian Kellers death is far from solved. But can a necklace really hold the secret to a murder?