Carolyn Keene 
Diamond Deceit [EPUB ebook] 

An urgent message from Bess draws Nancy to beautiful Carmel, California. Fading movie star Joanna Burton has accused jeweler Marcia Cheung of replacing the diamonds in her necklace with fakes. But the case of the missing stones turns even more sinister when Joanna ends up on the rocksat the bottom of a cliff! What led the actress to such a tragic final scene? Who pushed her over the edge? For Nancy, its a murder mystery with more twists and turns than the Pacific Coast Highway, and she knows shes in a race against time. She must find the stolen diamonds before the killer strikes again!