What Ever Happened to Baby Jane? — Henry Farrell

Book jacket: Baby Jane, a child star of early vaudeville, resented having to grow up in the shadow of her prettier sister Blanche Hudson, who became Hollywood's reigning love goddess. Now, some fifty years later, they are together and alone. And reality has toppled crazily into eerie fantasy. Blanche now finds she is growing old in the shadow cast by Baby Jane -- and a very sinister shadow it is.